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  1. #1
    Sr. Apprentice bmass2844's Avatar
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    Default 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
    Now i have a few of these symptoms, but not all. No black smoke, havent noticed much of a decrease in fuel mileage. I have noticed, if i shut the engine off, and immediately start it back up while the engine is hot, it shakes my whole truck. It starts easy and quick, but its a very harsh start. I think i will buy a new one and replace it to see if i can fix it. So i guess my question is, is the fuel pressure reg located on the fuel rail? and will i have to de-pressurize the fuel system. And also, is it common for these to go bad? Anyone have any experience replacing them and it fixing their problems? thanks

  2. #2

    Default

    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
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  3. #3
    Sr. Apprentice bmass2844's Avatar
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    Default

    99 silverado 1500 5.3l auto. new plugs and wires, new pre-cat oxygen sensors 86,000 miles.

  4. #4
    Legend 2ToNe04's Avatar
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    Default

    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|

  5. #5

    Default

    Quote Originally Posted by bmass2844 View Post
    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

    Now i have a few of these symptoms, but not all. No black smoke, havent noticed much of a decrease in fuel mileage. I have noticed, if i shut the engine off, and immediately start it back up while the engine is hot, it shakes my whole truck. It starts easy and quick, but its a very harsh start. I think i will buy a new one and replace it to see if i can fix it. So i guess my question is, is the fuel pressure reg located on the fuel rail? and will i have to de-pressurize the fuel system. And also, is it common for these to go bad? Anyone have any experience replacing them and it fixing their problems? thanks
    The pressure regulator is mounted to the fuel rail. It has a vacuum line going to it. Check the vacuum line for fuel. If you see any gas in the line the regulator is bad. If you don't have the tool to release the pressure pull the fuel pump fuse and start it up. Let it run out of gas. Then you can change the regulator.
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  6. #6

    Default

    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
    Bed Rails
    Billet Grill insert
    Bed Rug
    CB with PA system
    Waiting to be installed
    Two 8in RF HX2 punch( would have 12s but they got stolen)

  7. #7
    Sr. Apprentice bmass2844's Avatar
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    Default

    ok thanks for the info. Ill do that after work tonight. Ill let you know the outcome.

  8. #8
    Sr. Apprentice bmass2844's Avatar
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    Default

    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.

  9. #9

    Default

    Did you check your fuel pressure after you replaced the regulator??
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  10. #10
    Sr. Apprentice bmass2844's Avatar
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    Default

    no i didnt. I had already returned the tester.

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