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Thread: fuel pressure regulator question
07-15-2009, 08:54 AM #1
fuel pressure regulator question
ok so about a month ago i had posted about my trucks problems, rough idle, and the things i have done to try and cure it. i never found a remedy, and it seems to be getting worse, as well as new symptoms. Last week, my fuel gauge started jumping around, and my fuel pump has a loud whine. So i did some research on a bad fuel pressure regulator and this is what i got on every site i searched.
Fuel Pressure Regulator Failure Symptoms:
- Engine runs rough
- Engine stumbles or sputters
- Engine runs very rich - black smoke from the exhaust
- Engine will not start
- Engine starts but stalls shortly after startup
- Noisy fuel pump
- Noticeable decrease in fuel mileage
07-15-2009, 09:14 AM #2
What kind of a truck do you have?Jim
2004 SILVERADO 2500HD LS
Pro Comp Leveling Kit
285-75-16 Cooper ST All Terrains
Pro Comp Programmer
Linux Bed Liner
1967 Landcruiser <350 Chevy>
1990 Geo Metro Convertible
2007 FJ Cruiser
07-15-2009, 03:24 PM #3
99 silverado 1500 5.3l auto. new plugs and wires, new pre-cat oxygen sensors 86,000 miles.
07-15-2009, 03:50 PM #4
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when your fuel pressure regulator is going out or its gone out.
a. you have hard time turn it on
b. when it does turn on it smells like raw gas.
i had to replace this on my old 99 camaro.2004 4.8| Custom Paint| Tint| De-badged| Shaved Tailgate| Rollpan| Smoked Tails| Color Matched| Lowered 5/8| Suede Interior| Color Matched Interior| Indash & TVs| Mids-Lows & 2 12" CVRs| 500 & 1100 Interfires| Soundeadener| Outlaw CAI| Magnaflow|
Future Mods: 6.0 LQ4/9| Bags|
07-15-2009, 03:51 PM #5
07-15-2009, 11:27 PM #6
as jimmiee stated any fuel even dampness its bad take the vacuum line off and let it site for 5 min then look and see if any seeped out
2003 Z71 Silverado LS
Access roll up cover
Billet Grill insert
CB with PA system
Waiting to be installed
Two 8in RF HX2 punch( would have 12s but they got stolen)
07-16-2009, 09:10 AM #7
ok thanks for the info. Ill do that after work tonight. Ill let you know the outcome.
07-20-2009, 08:08 AM #8
Ok so now im even more confused. I got a fuel pressure tester, pressure was at 48 psi which is below specifications. 55-62 psi is normal. So i returned the tester and bought a pressure regulator, put it on in the Auto zone parking lot. Crank it up to drive home, and no change at all, still idling bad, feels like its loping. Im trying to keep from buying a fuel pump, since its $250, but its looking like thats my last option. The only thing that confuses me is, if it was the fuel pump, i would think i would have a stumble or hesitation when i accelerate. But it seems to acclerate fine, and cruise at any speed without hiccup. Only idle is where i notice a problem.
07-20-2009, 08:17 AM #9
Did you check your fuel pressure after you replaced the regulator??
07-21-2009, 08:45 AM #10
no i didnt. I had already returned the tester.
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