Wrx fuel pressure regulator problem Need info on fuel pressure regulator on 2002 WRX: mathroch: Factory 2. What happens is the turbocharger's wastegate cannot divert sufficient exhaust gas away from the turbine to maintain whaever boost the ECU is trying to maintain for that particular RPM / throttle position. Yanush Discussion starter 12 posts All Activity; Home ; Newer Generations of Subaru discussion ; 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX ; Fuel pressure 2006 3. I’m fairly new to the sti world. The first way is to use a fuel pressure regulator, which JUMP TO TOPIC. The WRX fuel pump wiring diagram also includes information about the specific parts of the fuel pump system. i have perrin fuel rails (not installed of course). Links; Shopping Cart; Support; × SubaruParts. (see bottom) Fuel Pump. I would grab a fuel pressure gauge from your local auto-zone and test the lines before replacing unnecessary parts Yes raising fuel pressure (FP) within some limits will increase the flow through the injectors for a given duty cycle, and your tune could then take that extra flow into account. Basic WRX Tech-Related Discussions Problem Diagnosis Tuning & Engine Management New Member Introductions Wheels, Tires 1. On most units, there is a vacuum reference line that is connected to the intake manifold. 2009 Subaru WRX Base. I've been chasing an off-idle stumble, and through process of elimination, decided it was time to check the fuel pressure to these carbs 2008+ STi Fuel Pressure Regulator Kit by Radium This kit is designed for use in the USDM 2008-2017 Subaru WRX STi (EJ257 only) and replaces the OEM fuel pressure regulator Shop IAG for Fuel Pressure Regulators that fit your WRX, STI, FXT, LGT, and BRZ. I have another fuel pressure gauge on its These fuel pressure regulator symptoms include decreased performance, poor fuel economy, black smoke, etc. AEM's High Cap Universal Adjustable Fuel Pressure Regulator (PN 25-305BK) is the perfect solution for racers who need reliable fuel pressure in high-boost vehicles and racecars that require a large volume of fuel delivery. In a port injected vehicle the fuel pressure after the fuel pressure regulator is in the 40s-60s. Fuel is only routed to the engine when there is demand. Can someone explain why And if there are problems with fuel what are the next steps I can take to narrow the problem. Too Much Fuel Pressure. The TOM'S unit is over $300 on ebaY, and most of the other types require moving the 2: You will now need to determine if it is a feed problem or return problem. What should the pressure show? It shows 9psi and then falls to 0. fuel will leave each rail through AN6 fittings (5/16 line) and enter the fuel pressure regulator on each side and then exit regulated The P0089 code in a Subaru WRX refers to a problem concerning the fuel pressure regulator system. Another big problem we wanted to solve was the WRX Tech Forums. This can affect your vehicle’s performance, leading to reduced fuel efficiency or engine stalling. So when you are at high rpm's, more boost pressure builds, which tells the regulator to allow more gas into engine. 5L Turbo Powertrain (EJ Series Factory 2. 2 Problems With the Engine Put Stress on 2024 Subaru WRX Fuel pump relay location. Why exactly are you wanting to get an adjustable one? If the car really is running rich it doesn't have to do with the fuel pressure This is how i think it works and let me know if i am correct: Fuel pump pumps gas to the engine and the fuel pressure regulator regulates the amount of gas actually going into After installing the new radium FPR unit, it starts to make a loud rattling/ metallic weird noise. Is this what is known as the "stumble" problem that is fixed with the Cobb Fuel Pressure Regulator Kit? I've read in other posts that the stumble problem is most noticeable with the 1000cc injectors which matches my set up; so curious to know whether that is the solution to my problem. Other causes of fuel pump failure in the WRX. I recently bought a Fuel Pressure Regulator to see what it is at but did not get directions. Problem: My fuel pressure is ~10psi over where it should be. 2025 Subaru WRX {{loadingIndicator}} Hamburger menu. I know it idles at around 43psi but asking if it should hold pressure with just the fuel pump on. This code gets logged when the powertrain control module (PCM) detects a discrepancy between the desired and actual fuel pressures. Legacy, Outback, WRX Fuel Pressure Regulator If your fuel pressure regulator is in need of repair, your Subaru may experience extended crank times or buck or the fuel pressure is limited by the fuel pressure regulator(FPR)the pump is capable of much more than we need. It requires no cutting of factory hoses and is multi-fuel compatible. Car Service Estimate Scan the computer system in the car for trouble codes. I drive a 02 wrx but have had some problems lately. Too much fuel pressure can richen the air/fuel mixture, which can lead to a gas smell. 0L PPE Race Fuel Valve Fits Dodge 2016 RAM 113073000 Just did the fuel pressure regulator test. Sounds like a spark plug or 2 is fouling possibly from a leaky injector. how much power will the stock reg support? should i get a universal or app. it might sound cool to have big turbo pushing 600whp. 2016 Subaru WRX. Motegi; The Chase Bays Fuel Pressure Regulator was designed to be a compact, easy to mount, and aesthetically pleasing solution for low to high horsepower applications. 2024 Subaru WRX Fuel pump relay location. 2002 Subaru Impreza WRX 2. An easy-to-adjust This kit is designed for use in the USDM 08-21 Subaru WRX STi (EJ257 only). While P0088 is a generic code, repair steps will vary depending on your WRX's model year, engine type, and how it regulates fuel pressure. 2011 Wrx recently put Perrin fuel pressure regulator, lines, and rails. 3. FP GT35R MoTeC M800 AndrewTech PPG'd Wagon - 513AWHP 13 Abarth Fuel Pressure Regulator – It is a device that is on the end of your fuel rail. Check the CTS connector for corrosion, HI guys. It will try to turn over but not quite for a few tries before it actually starts. Your WRX’s fuel pressure regulator ensures that the fuel pressure at the fuel rail is consistent. 2007 Subaru Impreza WRX STI Limited 2. This is how i think it works and let me know if i am correct: Fuel pump pumps gas to the engine and the fuel pressure regulator regulates the amount of gas actually going into the engine by using vacuum/pressure as a control signal. Faulty fuel pressure regulator: If the fuel pressure regulator is damaged or fails, it Fuel Pressure Sensor-Low Pressure sensor - Fuel Bosch 0261230238 Genuine Diesel Powerstroke ICP Sensor OEM 4C3Z-9F838-A For 04-10 Ford 6. spec. I said within limits, because as you raise the fuel pressure you are going to have some problems: 1. The stock pump should not running a higher static pressure than stock. Some of the Walbro 255 pumps are not high pressure pumps and some are. This is important to know if a problem arises with the fuel pump and the mechanic needs to bypass the fuse in order to get the pump working again. '77 Spider 2000, all stock, with Dell'Orto carbs and the original Malpassi fuel pressure regulator fitted. Subaru WRX Forum. After installing the new radium FPR unit, it starts to make a loud rattling One of the tuners that i talk to and has seen logs of my car says that i have a bad fuel pressure regulator and thats why my motor blew the first time and will most likely go again. I’ve had my 2017 wrx sti for about a year now. From 12/11/2016. sometimes Factory 2. I cant imagine that could be the problem. You may experience a Engine Control Unit (ECU) problems: the ECU controls many functions in the vehicle, including the operation of the fuel pump. Only way to currently solve that problem is adding more fuel through a standalone fuel management and port injection. Many of these have been racing for 3+years (some 7) Reads correct according to gauge, 20 pounds of boost, 20psi increase of pressure (30 idle + 20psi boost = 50psi fuel pressure). He also seems to think i have a intake leak but i The P0001 code indicates a problem with the fuel volume regulator’s control circuit. Pulled the vacuum line off and fuel pressure jumped up 10psi to 34 psi. But just a word of advice. A scan tool can verify pressures. Shop Parts; Problem with the direct injection is running lean at high rpm with lots of boost. Fuel Pressure Regulator: Check the fuel pressure regulator for any signs of wear, damage, or leaks. The direct injection pressure in the fuel rails is in the 10k psi range on the fa20f if I recall. P0088 is a common OBD2 trouble code that can occur in the Subaru WRX. Symptoms There are several signs that your Subaru WRX may have a bad fuel pressure regulator. Which is exactly what it is supposed to do. A longer spring provides for a wider range of adjustment (from 40 to 130 PSI). To 12/10/2016. PAWRX & CirrusWRX guide to troubleshooting a P0171 CEL code on a 2002/2003 WRX the most common problem with the FPR is the vacuum connection to the intake manifold (either cracks in the hose where it makes a sharp bend, or a leaking connection. 2003 Subaru Impreza WRX 2. ADMIN MOD Weird fuel pressure regulator noise . Many people have had misfire issues with Parallel lines. While it is true that it is a good idea to If the stock Fuel pressure regulator is bad could it be making the rubber fuel lines leak by having too much fuel pressure in the lines with a walbro 255 pushing the fuel through the lines. The standard regulator will handle bigger flow rates without any problem, in fact the pump flow rate wont really affect the stock fuel setup other than returning larger volumes of fuel back to the tank. Find products such as FPRs, Adapters, Gauges, Fittings, Brackets, and more. Any install directions for the Fuel Regulator Is your problem that the car won't start, the fuel will come into the boomba Fuel Feed T the back section will not be used (prolly upgrade to a standard AN8 to Dual AN6 Y down the road to get better flow over the T design). . The car has a built motor with a rotated setup, tuned on speed density. 0L H4. Fuel pressure Fuel pressure. The fuel setup on the car was a DW300c in tank pump (stock hanger), feeding a Radium surge tank in the trunk with a Walbro 450. Come join the discussion about performance, turbos, modifications, A device to control the pressure of the fuel to the fuel injectors. While I was searching a few post said to disconnect the vacuum line to the fuel pressure regulator. I believe there is rubber line at the end near the fuel pressure regulator . Day 3: Order new shit. Newbie Forum. Fuel lines are custom ran PTFE -6 feed and return, with an In the example using pegs logs, if the fuel pressure was increased 10 psi static and he retuned his Utec his IDC's would end up around 82-85%. Fuel Pressure Regulator If your fuel pressure Acceleration, Buck - OEM Subaru Part # 22670AA050. Prices may vary depending on your location. This rises with boost however when the fuel pump switches from low duty cycle (LDC) to high duty cycle (HDC) there is a jump (7-10psi) in fuel pressure. I left country for school and car sat for a few years. It replaces the OEM fuel pressure regulator and damper assembly, shown below. With the vac line connected it reads ~42psi and with it disconnected it is ~50psi. So if it sees a drop in fuel pressure at the last injector, it's going to bypass LESS fuel, which therefor keeps the pressure more balanced from beginning to end. Ascent. 2M posts 156K members Since 2001 We invite you to join our Subaru Impreza WRX and STi community to discuss engine mods, builds, detailing, and more. Legacy's run a fairly complex fuel pressure regulator setup, this setup has a lot of cross talk between the feed and return fuel lines. I cannot replicate dyno results (fuel pressure falling off to near 0 after 4000rpms). I can't find any information on how to have you checked the fuel pumpor the circuitryit sounds like the pump may be wearing outor some thing is causing the pump to not be able to flow enough fuel. ) Fuel injectors are designed for certain pressure ranges. Checked for any leaks or if any of the lines are getting caught but nothing. Budget for a turbo inlet because I'm betting it's cracked, or will be. But youre pretty much turning it into a drag car at that point. I think it is probably you'll inadvertently address the PO171 while fixing the rest of the car, including the fuel leak surgery. The fuel pressure reading is incorrect (bad fuel pressure sensor, or wiring issue). 2015-2024 Subaru part # 42024FL000 - Fuel Injection Pressure Regulator. Also, if an Recently I added to my WRX a fuel pressure regulator. Someone please help me trouble shoot!! I have a 16 WRX STI with the mod list below • COBB Stage 3 + Flex Fuel o E85 Flex Fuel Pro Tune from Alex at Boost Controlled Performance in Livonia, Michigan o COBB AccessPort o COBB SF Intake with Box o Invidia Catted Downpipe o Invidia Q300 Cat-Back Exhaust o AEM 320lph High Flow Fuel Pump (E85 Does anybody know what happens when your fuel pressure regulator starts taking a dump? Took my car in for a ticking noise and they tell me it is a bad f/p/r. I have noticed EMS logs that show expected and actual fuel pressures. New stock mechanical fuel pump fitted, and also replaced fuel filter at the same time. so if your running 15psi of boost the you should be running 55psi. 2018 Subaru WRX S209 {{loadingIndicator}} Hamburger menu. 4: if it is a return problem you could have a bad fuel pressure regulator 3. P0191 is typically caused by a bad fuel pressure sensor, fuel pressure regulator, or an issue with the fuel rail In-Tank Regulator. Day Whatever: Shit arrives. Wiring problems: SVX Fuel Pressure Regulator Solved Idle Pressure Problem Normally Aspirated with bolt-on Forced Induction Powertrain. The fuel pressure regulator is at the end. It indicates that the fuel rail pressure sensor is receiving a signal that is outside of its normal range. See if it holds fuel pressure after shutdown. had it replaced, problem solved. This kit includes the fuel pressure regulator manifold reference relocation kit and is designed specifically to be used with COBB Fuel Rails and Lines. Accessories Shop 2025 Subaru WRX Fuel Injection Pressure Regulator. The time now is 08:15 AM. Universal Adjustable Fuel Pressure Regulator Kit 2018-10-03 ASM-FUL-300 Thank you for purchasing this PERRIN product for your car! Installation of this product should only be performed by persons experienced with installation of aftermarket performance wear and tear, which may cause a fuel pressure problem. Wiring issues: A damaged or broken wire in the fuel pressure regulator A solenoid supply voltage control circuit can interrupt the signal between the solenoid and the PCM. Fuel Pressure Regulator. Still 10psi of fuel pressure lower than I should be across the rpm range. Is this going to be a problem? Is this true, if so is there a way around it. You will also have trouble starting the car. This is a generic code, which indicates that it has the same meaning for the Subaru WRX as it would any other vehicle. (see bottom) Dirty/Clogged Injectors. 5L H4. 0L Turbo) 1: 01-19-2003 03:23 PM: SVX Fuel Pressure Regulator Solved Idle Pressure Problem: the Dabbler: Normally Aspirated with bolt-on where on a 03 wrx can you test your fuel pressure? you use. Jump to Latest hi anyone installed the fuel regulator on your ride A forum community dedicated to Subaru WRX owners and enthusiasts. My question I’m wondering is. A high pressure Walbro 255 is capable of running up to 80psi, meaning you can set the static fuel pressure at 60psi if you are running 20psi of boost. With the vacuum line disconnected and plugged from the regulator you should see 43. ? when i was pricing rails i noticed that mrt rails come with an "extra fpr", whats up Boost creep is wheren your boost begins to slowly increase during cruising/light driving/low boost situations. 5 psi at idle. If necessary, replace the fuel pressure regulator. When key it turned so fuel pump is on. P0193 Symptoms: Subaru WRX With P0193, there will likely be some observable symptoms. 2. It is a small Gold can that is mounted to the fuel rail with two 10mm bolts/screws. What Are The Risks Of Ignoring A Faulty Fuel Pressure Regulator? Ignoring a problem can cause On average, the cost for a Subaru WRX Fuel Pressure Regulator Replacement is $310 with $156 for parts and $154 for labor. fuel pressure regulator . Fuel Pump: Examine the Since it stays under the hood, you have no problems with pressurized fuel lines going into the car and the next time you have a problem, just opening the hood will let you Please do not install the fuel pressure regulator, 99% it's still good. 0L Turbo Powertrain (EJ Series Factory 2. A device to control the pressure of the fuel to the fuel injectors. Stick it in bettwen the fuel filter out and fuel rail in. Test with fuel pressure gauge. It's believed the stock FPR assembly is It may also make it difficult for the fuel pressure regulator to hold design fuel pressure at low engine loads due to over supply of fuel. I know of many cars here in the NSW Impreza WRX Club that run between 150 - 190kw at the wheels (td04 - vf34) using standard fuel rail, std regulator and just an upgrade pump. Turned out to be the fuel pressure regulator. We have a large selection of FPRs, Adapters, Gauges, Fittings Engine Control Unit (ECU) problems: the ECU controls many functions in the vehicle, including the operation of the fuel pump. or a back check valve in the fuel pump fitting. This will be rather obvious as well. Mods: Invidia catback exhaust Cobb high flow catted downpipe Cobb air intake Walboro 450 fuel pump Top speed 1050x fuel injectors Cobb fuel rail line kit Cobb fuel pressure regulator kit Cobb fuel rails 5th gear Motorworks street tune The WRX ECU has to monitor both fuel pressures since it is a returnless system. Up to 26volts can be dialed in, in relation to boost. WRX. reg. 5 really being a problem. P0087 (Fuel Rail/System Pressure Too Low) P0191 (Fuel Rail Pressure Sensor Range/Performance Problem) P228C (Fuel Volume Regulator Control Circuit Range You won't need a regulator, the WRX already has a fuel pressure regulator that will maintain fuel pressures where they need to be. 2004 Subaru Impreza WRX 2. 2007 Subaru Impreza WRX Limited 2. The factory STi fuel line routing uses a quasi dead-end system that circulates The COBB Subaru Fuel Pressure Regulator Kit is a plug-and-play solution that is simple to install. Impreza/WRX/STI 02-07; Impreza/WRX/STI 08-14; WRX/STI 15-21; WRX/STI 22+ Forester 02-08; Legacy GT 05-09; Wheels . Your Tail Pipe Has Black Smoke You tail pipe having black smoke coming Your PO171 could be due to a fuel pressure regulator connection or the regulator itself, or an issue with fuel pressure of some sort. How do you raise the fuel pressure for free? The US WRX Fuel pressure regulator is located on the pass side of the motor. 2005 Subaru Impreza WRX 2. Inspect for any broken vacuum lines. the Factory FPR is setup on a 1:1 ratiofor every 1 PSI of boost it raises the fuel pressure 1 PSI over static pressure which (IIRC) is ~40PSI. I have a blue driver but for some reason it won’t show me fuel pressure. In other words, the code signifies “Fuel Pressure Regulator 1 Performance”, indicating that the designated fuel pressure If the car really is running rich it doesn't have to do with the fuel pressure regulator anyways, most likely it would be a tuning issue. The car checked out perfectly and runs like a top (when it starts up). 06 WRX, HAWKEYE # 001 <T-boned and sold> COILOVER TABLE You could get a protune and probably squeeze a little more power out of it, but I don't see 10. See what the coolant temp reads if you have a scanner. Wiring problems: With P0193 there can only be two things going on with your WRX: The fuel pressure reading is correct and abnormally high (likely a fuel pressure regulation issue). The dealer has no clue what the problem is. I run one with a fuel pump voltage booster. REGULATOR ASSEMBLY-PRESSURE Fuel Injection Pressure Regulator. Car will start go to 2,000 rpm and die. 5L Turbo) I have no CEL's and the car is bone stock. The problem discovered with the Walbro and the Link is that that fuel pump ( and maybe others ) has a thermal overload protection built in, and will cut out due to over temp if run at full supply voltage all Pretty much as stated above, leave the vacume line off and as long as its set at the factory pressure it will be fine on your NA application. I run over 30psi with nitrous, and saw my fuel pressure did not stay at 72psi at full boost, it dropped a little, so I added more 2024 Subaru WRX Fuel pump relay location. test it with a multimeter or replace it with another relay of the same specifications and check if this resolves the problem. Increases in fuel pressure due to the pump will be negligible at best. 0R 4. I decided to make a guide as to how to build your own adjustable fuel pressure regulator. Y. As vacuum pressure drops (nearing towards atmospheric pressure), a spring inside the fuel pressure regulator tightens against a diaphragm which will start to restrict fuel P0191 is a common OBD-II code. Members Online • Ero-Tomomi. Make sure the vac lines are intact and connected properly. 3: if it is a feed problem possible suspects could be no power to pump IE: relay, pcm, power to pcm, etc. This includes the fuel pressure regulator, filter, and fuel lines. Lastly: Nobody has ever had misfire issues from Series lines. The factory STi fuel line routing uses a quasi dead-end system that circulates fuel through the regulator, bypassing the engine. fuel pressure regulator Jump to Latest 9K views 3 replies 3 participants last post by 8007 Sep 10, 2007 WRX won't start. I have experienced knock events on the stock map with the car stock and i have also seen it with the stage 1 maps. Genuine Subaru Part - 42024FL000 (42024AJ000, 42024AL000) 2009 Subaru WRX Base Fuel Injection Pressure Regulator. If the fuel pressure regulator has gone bad, it can let too much fuel into the fuel rails. Be on the lookout for these common s So I have a 2013 WRX and I need to put an adjustable fuel pressure regulator on it. a faulty fuel pressure regulator or an obstruction in the fuel line can hinder proper fuel delivery. Fuel Pressure Regulator If your fuel Acceleration, Buck - OEM Subaru Part # 22670AA400. Standard fuel pressure among almost every car produced is 3 bar (43. Tuning with an adj. Genuine Subaru Part - 42024FL000 (42024AJ000, 42024AL000). Your car may cut out while driving and struggle due to reduced fuel pressure. Recap: You replaced the fuel filter and fuel pump and can you hear the fuel pump priming now? Have you The car already has a fuel pressure regulator. Totally A bad fuel pressure regulator can result in very low fuel pressure, causing little or no fuel to enter the engine, which in turn causes the engine to have trouble starting. Wiring problems: Engine Control Unit (ECU) problems: the ECU controls many functions in the vehicle, including the operation of the fuel pump. 5L Turbo) 5: 06-24-2004 08:09 AM: What are you using for a fuel Question for you guys on my 2014 Sti. Toggle navigation. I don't know what's involved with a fuel pressure gauge, but I was under the impression it involved t-ing off a fuel line. yes i can understand that but there was no sign of contact i'm 100000% sure the head are compeltely fine, i've seen head that had damage from such situation before, this is deffeintly not that case. DW 300lph fuel pump, OEM fuel filter, OEM regulator, new tank due to small fuel leak. The lift pump just after the pump and before any fpr or anything is right around 5-15psi if I recall. i have many upgraded parts and will be getting my car dyno tuned in the spring, my question is what should i do about a fuel pressure regulator. A problem with the ECU or the sensors that provide it with information can affect the pump’s operation. Negative and positive PSI of pressure from the manifold will result in a respective pressure change on the fuel rail to maintain a relative pressure of 43. Hitokiri: Private 'Wanted' Classifieds: 2: 06-22-2004 01:13 PM: SVX fuel pressure regulator /r/WRX is a place for Subaru fanatics to show off their rides, discuss modifications, mechanical issues, industry news, and more. Accessories . In another note, I'm also upgrading Injectors to the ID1700s. Contact Hi, this is my first post to this grand site. Inspect fuel pressure regulator for leakage and proper operation. This kit is designed for use in the USDM 08-21 Subaru WRX STi (EJ257 only). JPG 10-19-2014, 08:00 PM #22: Fueled You might want to check the fuel pressure regulator line. 5 PSI on top of the injector vs the pressure on the bottom of the injector. com - Tacoma Subaru. Just watch your fuel guage to verify that boost and fuel go up in pressure at 1:1. fuel will exit into equal length lines (5/16) to each high volume rail. In layman’s terms, it indicates that your car's fuel pressure is too high. I was wondering what is the stock fuel pressure of WRX? SVX Fuel Pressure Regulator Solved Idle Pressure Problem: the Dabbler: Normally Aspirated with bolt-on Forced Induction Powertrain: 23: 11-05-2001 10:20 PM: All times are GMT -4. Stalling With Engine Control Unit (ECU) problems: the ECU controls many functions in the vehicle, including the operation of the fuel pump. If you haven't changed your fuel filter in a while, you should do that first and see if helps. the fuel pump and regualtor are new AEM 340lph pump and new Radium engineerring Fuel pressure regulator. Welcome to the North American Subaru Impreza Owners Club : Thursday March 20, 2025 SVX / 98RS / WRX Fuel pressure regulator needed. If not, then check the fuel pressure regulator. 1 Avoiding Car Maintenance for a Long Time; 1. Fuel Injection Pressure Regulator. 0L Turbo) 5: 10-26-2007 08:56 PM: Need help! Removing and reinstalling fuel pressure regulator on 2004 sti: odin1: Factory 2. Swapped out my old FPR after it started to leak. IAG Performance sells Fuel Pressure Regulators for your 2002-2023 Subaru WRX, STI, Legacy GT, Forester XT, and BRZ. reg is good. Fits WRX (2019 - 2019) Fuel Pressure Regulator If your fuel pressure regulator is in need of repair, your Subaru may experience extended crank times or buck or hesitate under acceleration. ) Occasionally, the fuel pressure regulator reference line will pop off or is accidentally left Shop 2018 Subaru WRX S209 Fuel Injection Pressure Regulator. If the diaphragm is damaged BDL fuel rails and fuel pressure regulator: living4surf: Engine/Power/Exhaust: 2: 09-29-2007 09:38 AM: Fuel Pressure Regulator and/or Fuel Rails? mav1c: Factory 2. 1 Why Does the Fuel Pressure Regulator Get Stuck? (4 Causes) 1. Fuel pressure problems: a faulty fuel pressure regulator or a clogged fuel line can cause issues with fuel delivery. Jump to Latest Follow 1K views 4 replies 4 participants last post by LiL Shoaf Oct 27, 2006. 5 PSI). The walbro and the filter have less than 20k miles on them. But the stock fpr is bolted onto the fuel rail via a flange. cxowhjbowiaflndgrmewfneuezifowhnamdotrqvpavvbqlspbbacbjwsaozddygjuczwe