Can Bad Fuel Pressure Regulator Cause Hard Starting

(sensor lies, or bad actuators. What does fuel change? Well, focusing on developing intrinsic motivators is effective – that’s taking actions because we enjoy them, as opposed to extrinsic motivators, such as seeking approval or fearing negative outcomes. Low fuel pressure is another indication of a bad fuel pump. 7L Vortec used to start as soon as you bump the key, and now it is hard to start (mainly when its cold) it takes several cranks of the engine to start and after truck warms up its okay, usually in the morning or if the truck sits for several hours after running. Fuel System: Leaking or faulty fuel pressure regulator Plugged or dirty fuel filter or lines Fuel pump weak or defective check valve Injectors leaking or faulty. (bad Fuel Pressure regulator, or pinched fuel return line) Do the fuel pressure leak down test shown in above link! If you check your Ignition timing with a timing light ( with the freeze timing jumper placed) and discover the timing is off by more than 2 degrees. this video will help you identify. I have noticed once in a while my truck will lope like it has a big cam in it or something. Testing the fuel pressure regulator is a simple task that requires some. When the CPS fails you often will have a hard time starting the car when the engine is hot. Sometimes a bad fuel pressure regulator can send too much fuel to your engine cylinders. Check at idle and at WOT a plugged fuel filter, bad fuel pressure regulator, bad supply pump or a restriction in the tank can cause low pressure. The fuel injection system in the car must supply fuel to the car engine with a constant optimal pressure. The pressure regulator bypasses all un-needed pressure/fuel back into the tank. That would be the easiest way to check your pump. Mechanical Problems: Carbon buildup around the intake valves can also give your problems during a start and other performance issues. I had read some online articles about how a bad fuel pressure regulator was the cause of some trucks "hard starting". A fuel pressure sensor is responsible for metering the fuel pressure inside your fuel rail, and reporting back to the ECM (engine control module). High pressure oil flow can be disrupted by faulty check valve(s) or a faulty Injector Pressure Regulator (IPR) valve. A problem with any part of the system can cause your vehicle to run irregularly or not run at all. Also check and change the fuel filter and it wouldn't be a bad idea to blow some air between the fuel return hose of the regulator and the fuel filter assembly in case there's some debris in the line as a clogged fuel return line causes high pressure. That's the best way I can describe it. I have 50 PSI running. Mechanical Problems: Carbon buildup around the intake valves can also give your problems during a start and other performance issues. The check engine light is not on. If when you turn the key the engine turns over normally but will not start, there can be any number of reasons for this problem. I dismissed this as bad fuel the first time - but not the case. There is a tiny o-ring inside (about 1/4 inch diameter) that can occasionally fail and cause loss of fuel system rest pressure. Q3: “Toyota Tacoma starting problems – It’s incredibly hard to start when the outside air is hot. Fuel Related Car Fires. The series regulator works much like a cascode circuit in that the varying current passing through the amplifier is passed on directly to the power supply. Once I get around 6000 it starts cutting up and wont go any higher. If the check ball in the pump is bad and letting the pressure bleed then you are staying with 0 fuel pressure creating a hard start issue. This newsletter, now in its 19th year of continuous publication, is funded primarily through advertising and voluntary subscription contributions from our readers. So, instead of adjusting fuel enrichment with complicated computers and injection duty cycles, these systems just increase fuel pressure to add fuel. If there is fuel in the vacume line that attaches to it then it could be bad. can a bad fuel regulator cause a no start?. Learn the simple repairs you can do right at home, and which ones are best left to a professional. 8 V6, and it had very similar symptoms (fuel pressure regulator was bad/going bad), but I was just wanting to make sure. - The valve or valve seat within the fuel pressure regulator. Over fueling is cause by lies (inputs) to the ECU. This is because when the diaphragm is broken, fuel passes through it all the way through the vacuum line and ultimately reaches the intake manifold. It sounds like your problem is the fuel pressure check valve. If the coil on top of the injector head is faulty that will cause a misfire or no injection at all. You can bypass the relay if you suspect it is the culprit. Replace that part. If you skipped Steps 4 through 6 on the "Hard Start/No Start Diagnostic Guide," now would be a good time to review the fuel-related items. BTW, the FPR has to be removed from the old fuel rail and reinstalled in the new one so if it needs to be replaced there should be NO charge for the installation at the dealer, only the cost of the FPR. If you are using one of these types of filters insure that you. The vacuum line can be pulled off of each dampener/regulator and inspected for fuel. The fuel injection system in the car must supply fuel to the car engine with a constant optimal pressure. Precancerous cells are a normal occurrence in the human body due to imperfections in DNA replication. I will get some pics up tomorrow of the injectors and chip. Do you have fuel pressure. Leaky Fuel Pressure Regulator (Controls fuel pressure to injectors, which is critical for starting and proper air/fuel mixture). The security code means you have a problem with the ignition switch. My 02 Silverado has 242,000 miles on it and it has a continual "hard starting" problem. There are a few ways to check for fuel pressure. Line is plugged in (if that bit of info helps). this video will help you identify. It stays steady at 7. 1989 Corvette starting and idle problems My 60K mile Corvette has begun to start only when it is cold. Last week I put in a new fuel pressure regulator, no difference in performance. I had read some online articles about how a bad fuel pressure regulator was the cause of some trucks "hard starting". A problem with any part of the system can cause your vehicle to run irregularly or not run at all. Fuel pressure regulator(FPR) What is a FPR? What does it do? A fuel pressure regulator is a solenoid valve. A weak pump that isn't delivering adequate pressure can cause an engine to run lean, misfire and hesitate when accelerating. I just changed the fuel filter. This is because the fuel injectors are responsible for putting fuel into the engine. It allowed the pressure to bleed down after a few. A bad Fuel Pressure Regulator causes excess gasoline to pass through the lines and overfill the exhaust system. A spring inside the pressure regulator pushes against the diaphragm and helps regulate the pressure inside it. Fuel pressure should remain a consistent pressure. mats or a bad throttle assembly. The main relay sends power to the fuel pump and other systems on most Hondas of this vintage. I tested the regulator/rectifier and I dont think it tested right. Toyota is pretty much in the same boat. If so then you can ruled out the fuel pressure regulator and the fuel pump. Part of the Antarctica: The Farthest Place Close to Home Curriculum Collection. 0 Liter Diesel Engines The VT365, also known as the 6. Heres the underside. 3, I might feel more positive but these are know for fuse pressure regulator leaks, plus two plastic lines in the plenum that feed to the injector assembly. hi i am trying to diagnose a problem with my 1989 dodge w150 5. Yes I replaced the fuel pressure regulator with an oem ac delco one after swapping the regulator I have yet to get the car started. I suppose a fuel pump could be weak, and not be able to deliver enough fuel. This built up gas can come from a bad fuel pressure regulator. At very cold ambient temperatures -30 F -34 C or below, there may be insufficient vapor pressure in the fuel tank to supply fuel to the converter / regulator, resulting in no start or hard starting. this sounds like my fuel pump all over again. The fuel pump's job is pretty self-explanatory: to pump fuel from the gas tank to the engine. If any one is deemed bad, it is recommended to replace all the dampeners and regulator as they will typically fail near the same time. If the check ball in the pump is bad and letting the pressure bleed then you are staying with 0 fuel pressure creating a hard start issue. “There's something wrong with my fuel pressure regulator” This is a tech call that I field at least 5 times each week. Read also: 5 Causes of Car Engine Knocking Noise Weak Acceleration - One of the worst symptoms of a bad fuel pressure regulator is weak acceleration. I can't think of what could cause a sustained high vacuum after warming up but is this possible? WOT should crater manifold depression! From what I can figure the high vacuum causes the regulator to open sending fuel back to the tank causing a drop it rail pressure needed when backing off the pedal. There are a few ways to check for fuel pressure. Line is plugged in (if that bit of info helps). Unfortunately many trucks suffer from low or inconsistent fuel pressure which can cause a loss of power, EGT issues and excessive smoke. the culprit could be your fuel pressure regulator, a fuel leak, a clogged fuel filter, or clogged injectors. Either of these conditions can lower the engine's efficiency and cause the "Check Engine" light to glow. If you skipped Steps 4 through 6 on the "Hard Start/No Start Diagnostic Guide," now would be a good time to review the fuel-related items. "It's hard to know what the cutoffs do in terms of really reducing fire risk, and a critical issue is how much of this fire risk is due to PG&E's insufficient investment over the years of reducing. Fuel Pressure is critical for proper operation. even tho the engine is a MFI with injectors it stll does not have any back pressure after you kill the engine. Line is plugged in (if that bit of info helps). It should hold vacuum for atleast 5 minutes. * Fuel Pressure in the L-Jetronic system is quite critical. (It is important to. The problem seems to be low fuel pressure, fuel pump checks out, fuel pressure [is about 70 to 75-PSI], leading me to believe there is a bad fuel [diaphragm in the fuel pressure regulator]. Doe's something seperate spark and fuel injection? or do they get their power from the same source at the same time? Maf sensor? I read it can cause hard start. fuel pressure issues 2001 SPORT TRAC 4. Here's How You Diagnose An Engine That Won't Start. “Chile was an economic pressure cooker that’s been building for decades, and it exploded,” Rodrigo Booth, a professor at the University of Chile, told the Washington Post last week. If fuel pressure is within specifications, check the intake vacuum to see if there is an air leak that's upsetting the overall air/fuel mixture. fuel pressure question I went ahead and replaced the fuel pressure regulator today (60 bucks),I wont really know till tomorrow morning when I cold start the engine to see if it improved the starting. A loose fuel line on the suction side of the fuel system may cause air to be ingested into the system and may cause low fuel. 1989 Corvette starting and idle problems My 60K mile Corvette has begun to start only when it is cold. Faulty high pressure pump If the pump is faulty there will be a low. Car is Hard to Start. Debris in the fuel regulator valve will cause low fuel pressure. The pressure delivered by the pump must meet specifications because that's the way the engine is calibrated to run. It runs/drives fine. I'm aware that the cheap gauge might be off by a good bit, so I'm not taking the 34psi as gospel, but if it drops by 15 to 20% when I let off the throttle cable, that might be the source of the hesitation. If the fuel pressure regulator is not maintaining exact fuel pressure while the engine is running, it can cause the engine to run rich or lean, and in the event it goes too far in either direction, the engine will stall out due to an inability to properly burn the air/fuel mixture. You kick it to make it work, and you keep a good eye on its lube levels. Like problems in acceleration, defective fuel pressure regulator can also cause issues when decelerating. It has no residual hold pressure after switching off the engine. These operations are affected when a bad throttle position sensor feeds erroneous data to the car's computer. The only thing you didn’t mention is fuel, so I wonder if your fuel pump is getting weak, or the pressure regulator on the secondary fuel filter housing might be failing. Fuel is supplied to the common rail at high pressure from the high pressure pump. The fuel system in your car includes, among other components, a fuel pump, a rail that carries the fuel to the engine and a fuel pressure regulator. Do you have fuel pressure. 65bn) in the last three months compared with $5. A fuel pressure sensor is responsible for metering the fuel pressure inside your fuel rail, and reporting back to the ECM (engine control module). The problem seems to be low fuel pressure, fuel pump checks out, fuel pressure [is about 70 to 75-PSI], leading me to believe there is a bad fuel [diaphragm in the fuel pressure regulator]. I just hate to throw parts at it that won't fix it and I hate to have to tell my wife that that *last* $100+ didn't fix the problem. I know in the olden days a battery's purpose was to start the car and the alternator would charge the battery up. Gasoline Filled in Vacuum Hose. Using a backup wrench, remove the high pressure fuel line on the top of the rail. The ignition switch can cause some weird problems with these vehicles not just hard starting. Q3: "Toyota Tacoma starting problems - It's incredibly hard to start when the outside air is hot. If it starts up much easier because of this, suspect the pump is losing it's prime due to a problem with a one-way check valve in the fuel line near or in the tank. bad fuel pressure regulator is when you loose pressure in the rail right when you shut off the car. No/hard start hot or after stalling, usually re-starts after cool-down; Jerky, irratic idle; Possible DTC#'s P1211, P1212, P1283: Usually caused by low injection oil pressure or regulator (IPR) valve. The exact cause of type 2 diabetes is unknown, but we do know that some people are at higher risk for developing type 2 diabetes than other people are. Here's How You Diagnose An Engine That Won't Start. Your pressure should only be around 6 to 8 psi. Generally speaking, any other cause of poor running/a hard start cold would also cause problems while the engine was warm. Pull the return hose from the Fuel Pressure Regulator and see if it s wet with fuel after cranking the engine. As a result, the gas starts dripping from the tailpipe. A slump in the residential property. You might want to check the fuel pressure regulator for leaks. A bad ignition switch will cause the problems you have been experiencing. That's the best way I can describe it. The TZR is now out of production, and Yamaha aren't keen to push the remaining stocks. Both these cases were cured with a new fuel pump assy – this is just a heads up for another avenue to check if zero fault codes are found and engine is running poor after warm up. Fouled fuel found in a vehicle tank can usually be linked to a few suspects — it either came from the refinery, the distributor or the filling station down the street from your customer. If the relay is bad, the engine will still start after oil pressure builds during cranking. the culprit could be your fuel pressure regulator, a fuel leak, a clogged fuel filter, or clogged injectors. How do I test if a warm-up regulator is bad? My 1977 924 is having acceleration issues and wont go above 1000rpms. Honda: 5 Symptoms of a Bad Fuel System. if it has a vacuum line on it, check for cracks and splits. A few weeks later, the truck became hard to start. Don't throw it away! 4. Typical causes of losing the prime on your fuel system, in order of prevalence: Bad vacuum-operated fuel pressure regulator (pull the vac line off of it and check for the presence of fuel, indicated the rubber diaphragm inside is busted), bad check valve in the fuel pump, or a leaking injector. The fuel rail comes with a sensor that monitors its fuel pressure and change the pump speed accordingly. 5 PSI at idle. He said that the scanner sometimes gave him bad readings about O2 sensors, because he said he has never seen all O2 sensors go bad at same time. Holden Commodore VS, VT, V6 Right hand 02 code even after fitting new 02 sensor. bad fuel mix or mix sensormaybe the fuel pumpit could also be spark plugs//. I checked the fuel pressure at the fuel rail on the right hand side of the engine (5. Tips for Diagnosing Fuel Delivery Problems by Tommy Samuels. With a decent scope you can then freeze frame the waveforms and see what pressure a duty cycle of say 70% on time produces as a pressure reading at a given rpm. If it helps then you may have a leaking fuel pressure regulator or fuel injector sending fuel into the intake on hot shut down. - The valve or valve seat within the fuel pressure regulator. That's the best way I can describe it. The fuel pressure regulator controls the fuel pressure into the injectors. This can cause the engine to run rough, stall, or have a no hot start condition, often with trouble codes P2284, P2290 or P2291. Some mechanical fuel pumps need a regulator if it is a high volume pump, if that is the case yo can be sure that is your problem. A weak pump that isn't delivering adequate pressure can cause an engine to run lean, misfire and hesitate when accelerating. A lack of lift pump flow will not only cause a no start issue, but depending on how it failed, can cause other issues that we will discuss further into this post. In fact, these two work in tandem, so when something goes wrong with one, it may cause problems with or seem to be a problem with the other. Fouled fuel found in a vehicle tank can usually be linked to a few suspects — it either came from the refinery, the distributor or the filling station down the street from your customer. The fuel pressure regulator is responsible for keeping your fuel lines at a constant pressure rating while also preventing the use of too much fuel during acceleration, deceleration, and other emission heavy operations. 3 Fuel System Repair Parts and Buy 7. As a research scientist at the School of Oceanography at the University of Washington, she studies the rocks that form on the ocean floor, particularly a specific type of rock that is found along volcanic. Check earth circuit for both 02s at ECU pins D14 and D16. A common problem with these valves is that they can cause fuel pump noise (whine). The fuel rail on your car is a shiny aluminum stick that runs along the back side of the engine between the engine and firewall. A problem with any part of the system can cause your vehicle to run irregularly or not run at all. Here are a few examples I witnessed while monitoring the fuel pressure at the fuel rail schrader: 1. However, when the sensor itself causes a problem, P0452 or a P0453 set for the fuel tank pressure reads low or high respectively. Once you drive the truck, and let it sit for a few hours after, then go to restart it, it will turn over several more times than what it should. 3 and checked fullsizechevy. How to check fuel pressure on a general motors truck and what easy checks you can do to diagnose a fuel pressure regulator problem check out my other videos. By hard starting, do you mean it cranks over for a bit before finally starting? If so, this could be a loss of fuel pressure issue (leaking fuel pump, fuel pressure regulator, injector, etc. how can i tell if my fuel regulator is bad? my car wont start. Read also: 5 Causes of Car Engine Knocking Noise Weak Acceleration – One of the worst symptoms of a bad fuel pressure regulator is weak acceleration. You feed it the best fuel you can find, because the stock pistons run a 9. com, “The RVers’ Voice of Reason. Having bad fuel injectors can cause bad mileage. With total pump failure your engine will just not start. 3L engines for making power and operating efficiently. If this happens you will have to disconnect the battery (because the permanently closed solenoid contacts will crank your battery dry) and either replace or repair the starter solenoid. Gasoline drips out of the tailpipe. The reason is simple. rich running, particularly the back plugs where the fuel pressure regulator vacuum line runs into the intake plenum. “There's something wrong with my fuel pressure regulator” This is a tech call that I field at least 5 times each week. It should hold vacuum for atleast 5 minutes. The fuel line is low on pressure, and doesn't keep pressure after the car is shut down. Wait a couple of hours, it will start, run a couple of seconds, die again. This causes a drop in rail pressure (see "low fuel pressure") which results in hard starting or not starting at all issue. In fact, these two work in tandem, so when something goes wrong with one, it may cause problems with or seem to be a problem with the other. ) The ignition timing may be set wrong. I have recently replaced the fuel filter, air filter, and fuel pressure regulator in attempt to fix this problem. Replace that part. The fuel pressure regulator is an easy replacement if it's bad. Fuel regulators rarely fail, but if they do, it usually results in low pressure. bad fuel pressure regulator is when you loose pressure in the rail right when you shut off the car. The pump is a constant pressure, but the demand changes, hence the pressure wants to vary. I had read some online articles about how a bad fuel pressure regulator was the cause of some trucks "hard starting". After all this I am getting the following codes (P0191 and P0087) and I think I need replace the fuel pressure regulator on the other side of the fuel rail. One of the most common failure modes for the FPR is to fail closed to the point that fuel rail pressure is extremely high. If it helps then you may have a leaking fuel pressure regulator or fuel injector sending fuel into the intake on hot shut down. The fuel line is low on pressure, and doesn't keep pressure after the car is shut down. This is the vacuum line for the fuel pressure regulator, this should be attached to the LHS vacuum port between cylinders 3 and 4 correct ? What is the effect on performance with the fuel regulator vacuum line disconnected ? Does the vacuum line increase fuel pressure at WOT and high throttle settings ?. You should have almost full pressure even into the next day. At engine idle, a vacuum hose attached to the regulator causes the diaphragm to push against the spring with extra pressure, reducing the fuel pressure in the system. This could mean the fuel pump check valve is bad. A give and take. For the engine to start normally, it requires sufficient fuel pressure, an appropriately timed spark and normal compression. Fuel pressure was perfect, except the truck would start, run for about 5min, then start hesitation real bad, then die out, unable to restart until it cooled. Rectify any fuel leaks and then recheck the pressure in the fuel rail. If the fuel pressure regulator is not maintaining exact fuel pressure while the engine is running, it can cause the engine to run rich or lean, and in the event it goes too far in either direction, the engine will stall out due to an inability to properly burn the air/fuel mixture. Connect a fuel pressure gauge to the fuel pressure shredder valve. When your engine starts it will use the fuel in the fuel lines. There are two different problems that a bad fuel pressure regulator can cause: Low Pressure Most problems with fuel pressure are due to the pressure being too low. bad fuel mix or mix sensormaybe the fuel pumpit could also be spark plugs//. 6bn in the same period last year and warned that it might miss its targets to reduce debt and pay back. Most people on the road have Fuel Filter problems; I know this because the most common car problems are Fuel Filter issues. I unplugged the vacuum line on the fuel pressure regulator, tried to start car and got the exact same fuel pressure readings as when the FPR vac. Try starting the motor and get a fuel pressure reading. My neighbor doesn't have this problem. 1989 Corvette starting and idle problems My 60K mile Corvette has begun to start only when it is cold. Soap box: Electronic pulsed fuel injections systems are complex and are not a topic for back-yard mechanics. It was stated the fuel pump was going out big time. I know in the olden days a battery's purpose was to start the car and the alternator would charge the battery up. If when you turn the key the engine turns over normally but will not start, there can be any number of reasons for this problem. This causes a drop in rail pressure (see "low fuel pressure") which results in hard starting or not starting at all issue. "Hard start" Due to Leaking Fuel Pressure Regulator Problem Description The fuel pressure regulator can leak and cause a hard start condition, without any faults recorded in the engine computer. Rough Engine Idle: One of the most common symptoms of faulty fuel injectors is an extremely violent or rough engine idle. Start by checking the fuel line to rail connections while the car is running wiggle the lines if they start to weep fuel this could be where air can get in when the engine is not running. CE light came on and independent hooked car up to CS2200. Each time I bleed the gas vapor out of the fuel rail, the truck will start normally several times before it again becomes hard to start. Since the car runs fine and fuel mileage is great I'd be leaning towards a fuel pump issue rather than the other ones I mentioned. When your engine starts it will use the fuel in the fuel lines. The fuel rail comes with a sensor that monitors its fuel pressure and change the pump speed accordingly. Fouled fuel found in a vehicle tank can usually be linked to a few suspects — it either came from the refinery, the distributor or the filling station down the street from your customer. These two components have O-rings that wear out with time and from dry heat. Make sure the pump is running properly, mechanics usually conduct a test by listening to it. It does’nt even fire like it wants to start. The truck cranks fine but sometimes won't start, sometimes starts but idles poorly, and sometimes starts normally. 3 - Fuel Distributor P/N 102807 Internal Pressure Regulator - The fuel distributor contains the primary pressure regulator for the fuel system. Check fuel quality, electric fuel pump pressure and fuel pump inlet restriction. Fuel leaking from near the tailpipe and black smoke coming from the vehicle's exhaust system are both common symptoms of a bad fuel pressure regulator. A weak pump that isn't delivering adequate pressure can cause an engine to run lean, misfire and hesitate when accelerating. Check fuel pressure. So, pull them both and check for raw fuel in the vacuum lines. Also, a return fuel line from the fuel pressure regulator. Luckily the regulator on/at the end of injector rail is used more as an fuel damper vs. Excessive sun exposure can cause the uncontrolled growth of skin pigment cells called melanocytes, leading to lesions that may look like harmless, slightly irregular moles, when, in fact, a serious cancer is growing just under the skin. Long issue about not starting when warm, can someone, anyone verify what fuel rail pressure they get when cranking the engine, either by disconnecting the coil packs so it won't start or by just kicking the starter a few times so it'll spin but not quite start. Service the valve with a decarbonizing chemical, if necessary. Heritage-Crystal Clean, Inc. I was ready to buy their overly priced fuel pump too if it was in fact bad. Its underneath the upper intake manifold, you have to take off the throttle body and wiring. There are a couple of place online you can get a secondary fuel filter cap with an 1/8″NPT fitting so you can hook up a fuel pressure gauge and see if the pump is maintaining pressure. A truck runs out of fuel on the South-Eastern Freeway and just 30cm of protruding trailer causes utter chaos. For this step you will need a fuel pressure test kit. This style of regulator increases fuel pressure at a greater than one-to-one ratio. The easiest test for converter plugging is done with a vacuum gauge. Mechnical fuel pumps would have a hard time providing the pressures and accuracy of flow and pressure needed for computerized fuel injection, thus all computerized fuel injected cars have electric pumps. The fuel pumped by the fuel pump must be at enough volume and pressure to overcome the spring pressure; the excess is sent to the return line back to the fuel tank. Here are a few examples I witnessed while monitoring the fuel pressure at the fuel rail schrader: 1. White smoke from exhaust - could it be anything other than head gasket? This can be caused from a leaking fuel pressure regulator. Service the valve with a decarbonizing chemical, if necessary. Each time I bleed the gas vapor out of the fuel rail, the truck will start normally several times before it again becomes hard to start. Little or no change in fuel pressure would indicate a weak fuel pump, not a bad regulator. can a bad fuel regulator cause a no start?. These can stick, seals get damaged, have the sensor go bad or the wires get damaged. A bad Fuel Pressure Regulator causes excess gasoline to pass through the lines and overfill the exhaust system. The problem has something to do with the excessive buildup of gasoline. Fuel Pressure Regulators-So, Fuel pressure can run between 25 to 60 pounds of pressure depending on the vehicle and manufacturer. Either of these conditions can lower the engine's efficiency and cause the "Check Engine" light to glow. 5 volts or so. Common problems are clogged vent holes, which can cause irregular fuel flow and can lead to trouble. Fuel tank must be free from debris and fuel pressure needs to be constant and consistent. then it can cause flooding. was revving in Neutral, POP, tow truck. ok, here is my problem. Make sure you don't have fuel leaking from these ports. I checked the fuel pressure at the fuel rail on the right hand side of the engine (5. The check engine light is not on. When I turn the engine off, the fuel pressure will bleed down to near zero in 4 to 5 min. " I declined having them do the work as I can do either one myself. 4 v6 fuel injection camaro doesnt start right up?Start with the cheapest and simplest and go from there. No start- Fuel pump relay bad, listen for pump noise just after clicking the starter. So I fixed something, just not what was causing the symptoms. We need additional tests to isolate the actual cause. There is a sensor on the fuel rail that monitors fuel pressure at the rail to determine fuel pressure and vary the pump speed accordingly. 0:1 compression and will pink like a set of shears on crap fuel. it may be the fuel pressure regulator thats bad, it may be flooding out engine. My GP had recently asked me to come in for some blood tests after a routine check-up showed I had high blood pressure, with no obvious cause. If you start seeing black smoke, the cause can likely be attributed to a bad fuel pressure regulator. The pressure may be fine while the pump/engine is running but during starting, a loss of pressure AFTER the pump turns off will cause bad starts. I'm having issues with the ignition switch on my 2000. The primary culprits of low fuel pressure are the pressure regulator valve on the back of the fuel rail, the check ball located above the screen type fuel filter. No codes are thrown so far. But more often than not, fuel pressure and fuel pump errors can commonly be attributed to a bad fuel filter. Pending failure can often be detected by high pump noise while they are running or poor engine performance and hard starting. These operations are affected when a bad throttle position sensor feeds erroneous data to the car's computer. Again, if you notice even a slight issue, it’s important to have it checked to correct any problems fast before further damage can be inflicted. Depending on how bad it is, you will need to prime the fuel pump before it will start again. If fuel pressure is within specifications, check the intake vacuum to see if there is an air leak that's upsetting the overall air/fuel mixture. Most fuel pressure regulators are connected to manifold vacuum and vary the fuel pressure according to engine load. A worn out or faulty regulator may also cause the check engine light to turn on or the engine compartment to smell of gasoline. When I turn the engine off, the fuel pressure will bleed down to near zero in 4 to 5 min. the hard start is about 10-12 seconds. This is usually seen more in the colder months especially if the battery is run down. There plenty of gas in the car. Bad fuel pressure regulator – these usually last 15 years, and then start to fail. Common Rail Diesel Fuel Systems It also damps pressure vibrations caused by the high pressure pump and injection processes. The fuel system on your vehicle is returnless. High pressure oil flow can be disrupted by faulty check valve(s) or a faulty Injector Pressure Regulator (IPR) valve. The function of the FPR is to keep the pressure in the rail at a constant level. 3 IPR valve — Injection Pressure Regulator sensor — works together with the high pressure oil pump to "create" oil pressure. Fuel gear pump pressure regulator sticking or leaking High-pressure pump capacity decay (high leakage to drain from the high-pressure pump) Fuel rail pressure relief valve leaks to drain Fuel rail pressure relief valve opens at too low a pressure Injector fuel circuit leaks to drain. Low fuel pressure is a major killer of injectors. Is the fuel tank pressure sensor important? Should I worry much if it fails? Of course, you can still drive the car with a failed fuel pressure sensor, but the risks involved. It's installed inline between the fuel pump(s) and pressure regulator. which of the following would not cause a hard to start problem on the PFI engine defective oxygen sensor The PCM checks for a closed throttle plate each time the engine starts. Because of its simple design and dependence on vacuum forces, the fuel pressure regulator does not frequently have problems.