Fuel Pressure Regulator Symptoms and Testing

Todays video is dealing with fuel pressure regulator symptoms and testing. I'm using my 2003 Jeep Tj to to the fuel regulator test with a fuel pressure tester. having a bad fuel pressure regulator can give you all sorts of issues from black smoke, backfiring, hard starting,bad acceleration, bad fuel mileage and so on. this video will help you identify and troubleshoot these problems.
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[marktindal]

10 seconds into the video I hit like, when you have a problem like this you need a guy who looks and talks like this. An expert! Thanks.

[wrongcowboy]

Thanks for keeping a Master Course class in bad fuel pressure regulators in main stream communication %110 in less than 10 min. Bravo

[samj]

Just watched your video and you described the exact problem(s) I have been experiancing with my 1996 Grand Cherokee Laredo. It was dying out while driving on the freeway at high speed and on surface street lower speeds. A shop changed the camshaft sensor, the plugs and wires and the fuel filter. Problem went away for a few days and came back even worse. I changed the ignition coil (it was going bad) and ran injector cleaner and octane booster and the problem again went away but came back. I called a mechanic that worked on my Jeep over a year ago and explained the problem and what had been done and the first thing he said was fuel pressure regulator can be going bad. I am going to change the fuel pressure regulator and I will let you know the results. Thank you for the great video and explanations.

[groverrambo]

I'm a 72 year old " Shade Tree Mechanic", and a new subscriber, cuzz I"m totally impressed!

[davidreynolds]

Im impressed. I motorhead whos own vehicle runs like it should. Thats rare. Im dealing with a 90 f150 4.9liter that was running horribly. The plugs had been in so long they had welded themselves in. They literally had slag around the ends of the plugs just past the threads. After finessing them out i did the wires rotor cap dist etc and it was running like a new truck. With one microscopic miss at idle every 11/2 to 2 mins. The owner obsessed and had it taken to a shop before i could find a high pressure injection cleaner. When it came back it was running worse than before i started on it. Check engine light has never come on. Other than pulling one of the plug wires apart and them reinstalling the new plugs finger tight i cant figure what they did. It spits sputters hard start no accelleration and stomping it to the floor does very little under 100 yards. No smoke. No fuel smell. I bought a feul pressure test kit . as soon as i can get my big ass up in there ill attempt to locate the pressure relief valve on the fuel rail.

[christianratliff]

Thank you man iv been wondering for atleast a month trying to figure out whats goin on with my truck and that fixed it

[caddisguy]

Thank you for this video and all the other useful videos you have posted up on your channels. I recently (regrettably) asked a shop to smoke test my EVAP system to diagnose a P0456 on my 03 TJ. They couldn't find a leak and took the parts cannon approach and replaced the LDP at my expense. No fix. Ended up replacing the gas tank (which they only noticed a leak from the stem after dropping down the tank multiple times, speculating they might have actually broke it) ... they give it back to me, and it wouldn't start first try after sitting more than 10 minutes. Took it back again held it for several more days (they had my Jeep for most of an entire month) and gave it back to me saying nothing is wrong. Service Desk guy says it starts fine for him (didn't even have a tech test fuel pressure) ... I knew it wasn't holding pressure and was either the pump or regulator. Soo, finally they change that out (after several more days in the shop) and it starts fine, but now it's running rich (guessing since it leaves a pile of carbon below the tailpipe wherever I park) Now I am trying to diagnose it myself (cutting my losses with the shop as they already took me for a few grand already and I'm worse off each time I let them touch it, so not going to let them hold the jeep weeks/months just to mess it up more)

Any idea what would make a ridiculously loud high pitch noise from the tank area? It sounds like a bad case of tinnitus and loud enough I can hear it over 100 yards away when I'm out in the bush. It started after the gas tank replacement, before the pump/regulator was changed and only does it when the engine is actually running. EVAP code is gone, but I am suspicious of what the "fix" actually was (ie: if it was actually the tank, or if that's just another thing they messed up or if they did something hacky) I've run it a bit with the gap cap loose, purge valve vacuum off, etc and can't get it to pop a code (not even a pending code) .... can't wait to get to the bottom of all this and maybe bust out a rant video.

Anyway thanks again for all the videos. My wife and I are loyal subscribers from BC! Big fans of Tom Cat as well :)

[JimGriffOne]

I had serious hesitation on my car last year. Thought it may be FPR, but turned out to be a bad upstream lambda sensor. Was awful under closed-loop so I'd put my foot to the floor, then all of a sudden BOOM! Massive power instantly. Felt like a rocket booster kicking in haha!

[__WJK__]

Have the exact same fuel pressure test gauge... wouldn't trade it for the other version even if the other version were free!

[wildangel]

Could you please pleas please do a video on a 2005 chevy trail blazer fuel pressure sensor location and replacement. I’m poor. Gotta do this myself if possible.

[chrissupport]

Good video.. LOTS of good info in a short time. Came here after 95 Taurus failed to start first time since I owned it in 96 (just turned over 100K miles).. fuel pressure, spark, or (to add crazy variable) anti-theft alarm may be blocking either. Also cooling fan stuck on (coincidence or related??). It'll be an adventure and I'll learn much.

[waltwood]

My 99 ford f150 would run great cold but as soon as it warmed up it would run rough idel rough and miss like crazy throughout driving and run fine after but smell raw fuel...also when you stopped at light idel would drop to 300 rpm ...changed fuel pressure regulator under hood and it's good to go...

[IAmRootGarage]

I have a 98 TJ 4.0 It randomly stumbles sometimes pretty violently, but I have driven it with a fuel pressure gauge on. It is pretty solid at 52 while driving, but at an idol the gauge fluctuates between 52 and 54 so quickly you can barely see the needle. I have pretty much the same gauge you do in this video. When I rev it it still says 52. The weird thing is it takes a while to crank before it starts. Once it has started once it starts pretty quickly after that initial start. It doesn't seem to prime with just the key on unless I turn it on and off a few times or if I just crank on it till it starts. I am not sure what the fluctuating needle means, but it sounds like my pump is ok based on this video. It is at 52 and stays there while reved. I am not sure if the hard starting is because of the lack of prime, or if that is why it is stumbling. I am trying to rule out the pump. Any ideas of how I can rule out the pump as an issue? It seems like the pump is good but I am not sure if it is supposed to prime and if so why it isn't initially in the morning. This problem started randomly one day. I did replace my distributer, coil and wires because initially not only did I have this problem, but I lost spark too. I now have spark, but this weird hard start and stumbling issue. I am not asking you to fix my Jeep just guide me where to test more specifically based on my issue? Great video, lastly is my regulator on the top of my tank too on a 98? Thanks in advance. Oh also no codes, and the light does work.

[jasonbohman]

GOD DAMNIT maybe it's your wirhly beard but i like your wrenching/mechanic videos more then the next guys, much more to the point and informative love it! keep up the good work!

[turnupdot]

Hey bud first off I like to say thanks for all your content you actually helped me out quite a bit....moving forward please... I have a 1997 dodge Dakota 3.9 gas..about 2 months ago I started to notice it losing power and every now and then a code GEN started showing on the dash.about a month ago it shut off twice on me while coming to a stop. Barely shifts gears and today it won’t stay running when engine warms up after that it shuts off quicker with every start only running for about 1-4 minutes on warm engine in ANY gear at a stop or while accelerating it would just shut off each start gets harder as engine warms.i changed out the tps and the iac and the battery as it then started needing a jump.unclogged the back cat also.please ANY suggestions would be HIGHLY appreciated!

[william]

Good video. What brand is the black pressure gauge ? Thanks

[genericdude]

I have intermittent low fuel pressure. The fuel pump did die and was replaced with a new assembly (Delphi) and the fuel filter (Motorcraft) was replaced at the same time. Fuel pressure is usually 40 PSI (according to my scan tool) but sometimes it drops below 25 PSI and it even dropped to 0. I have replaced the fuel rail pressure sensor with a Standard part. There have been occasions where the pressure went to 60 PSI. What do you think the problem is? There is a Fuel Pump Driver Module that hasn't been replaced, also. There are no codes. The car drives OK except for some jerkiness when cruising at a particular speed. 2002 Ford Mustang GT 4.6L(2v).

[wqui]

Awesome video, question, i have a 2001 Subaru Forester, I just tested my pressure and noticed that the pressure drops when I shut it off, would that be pump or regulator? TIA

[brandonk]

Ok so riddle me this. Bought a fuel pressure test kit. Said I had ~9psi (1994 chevy suburban c1500 with 5.7L TBI). So I went ahead and changed the fuel pump and screen, and the fuel filter. Tester still shows ~9psi. No dip in pressure when I rev engine up. Sometimes idles a little rough (you can feel the hiccups every now n then.. maybe 2-6x a minute) and recently had a bout where my idle rpms were fluctuating by 100-300rpms. occasional hesitation during easy acceleration, stumbles and hesitates badly on hard acceleration, two times during hard acceleration my rpms dropped 1k in a split second and almost stalled. Has new pump, new fuel filter, new tps, relatively new distributor (rotor and contacts look good) so now I'm stumped.

[r.d.ontheroad-]

Will F P R keep an engine from starting ---Just bought this rig RV -- It was running but not great and revving it up and it would back fire. ---- Drove it a few miles, couldn't make the hill! Backed it down the hill. Then after shutting it off, I have only been able to start it one time! For a minute or so! Now I can't get it to start! ---- put in new plugs, , wires, Throttle Position Sensor. Rotating the timing! Puzzeled !!!! I do Disaster Relief, but not going anywhere until I am up and running! Thanks, Rick