Thread: Low Fuel Pressure on first start up. HELP!!

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  1. #1 Low Fuel Pressure on first start up. HELP!! 
    bbptech
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    Default 01-29-2010
    Alright so i finally got my car started up After my XPZ Build. Im sure alot of u have seen my XPZ Build thread. Everything sounds good. Exhaust leak at the DP. No leaks. But my fuel pressure is reading at 18-20 PSI. I know that doesnt seem right to me at all. I have ZZP Fuel Logs with Fuel Labs adjustable FPR. Would i just need to turn the brass fitting in the back out till my pressure goes up? Or no?

    The computer has a canned tune for now. Tune will be later in the spring.

    I have the standard HP Tuners and was snanning at idle. I cant see my ST B1 or ST B2 which as i under stand is Short Term fuel trims, correct? I noticed my LT B1 was in the red and said 16.4 under it. What does this mean?

    Please help me. lol.
    ZZP 10.4mm's, ZZP S2 IC, 3.4, 3.0, Ported Gen V, ZZP Headers, ZZP CNC Heads, ZZP 78mm TB, ZZP Aluminum Valve Covers, Meziere Electric WP, ZZP Fuel Pump, ZZP Fuel Logs, 65 Mototrons, 3.29's, 2500 Stall. Tuned by GLANZERGTX and Kyle. E85 Converted, 21* Timing
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  2. #2 Re: Low Fuel Pressure on first start up. HELP!! 
    silverstreak
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    Default 01-29-2010
    Quote Originally Posted by bbptech View Post
    Alright so i finally got my car started up After my XPZ Build. Im sure alot of u have seen my XPZ Build thread. Everything sounds good. Exhaust leak at the DP. No leaks. But my fuel pressure is reading at 18-20 PSI. I know that doesnt seem right to me at all. I have ZZP Fuel Logs with Fuel Labs adjustable FPR. Would i just need to turn the brass fitting in the back out till my pressure goes up? Or no?

    The computer has a canned tune for now. Tune will be later in the spring.

    I have the standard HP Tuners and was snanning at idle. I cant see my ST B1 or ST B2 which as i under stand is Short Term fuel trims, correct? I noticed my LT B1 was in the red and said 16.4 under it. What does this mean?

    Please help me. lol.
    LT B1 means "long term fuel trim bank 1" and if its at +16 then I would say you have a pretty big vacuum leak.
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  3. #3 Re: Low Fuel Pressure on first start up. HELP!! 
    bbptech
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    Default 01-29-2010
    Quote Originally Posted by silverstreak View Post
    LT B1 means "long term fuel trim bank 1" and if its at +16 then I would say you have a pretty big vacuum leak.
    Ok well a breather is on at the moment,so that could be the cause of vacuum leak. Could that be my problem with the low fuel pressure reading?
    ZZP 10.4mm's, ZZP S2 IC, 3.4, 3.0, Ported Gen V, ZZP Headers, ZZP CNC Heads, ZZP 78mm TB, ZZP Aluminum Valve Covers, Meziere Electric WP, ZZP Fuel Pump, ZZP Fuel Logs, 65 Mototrons, 3.29's, 2500 Stall. Tuned by GLANZERGTX and Kyle. E85 Converted, 21* Timing
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  4. #4 Re: Low Fuel Pressure on first start up. HELP!! 
    TheOtherNick
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    Default 01-30-2010
    No. Just try adjusting the regulator either way and see what the pressure does. Is it an aftermarket pump? Did you rewire the pump? If so check the voltage at the pump.
    01 gtp-big cam e85 dd 78dodge- guzzling fuel 05 cummins- rollin coal
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  5. #5 Re: Low Fuel Pressure on first start up. HELP!! 
    jaysgtp360
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    Default 01-30-2010
    un hook fuel pressure regulator while watching FP. See what happens...should go to max while unhooked..48-53 should be normal at idle
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  6. #6 Re: Low Fuel Pressure on first start up. HELP!! 
    bbptech
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    Default 01-30-2010
    Quote Originally Posted by 01GTP View Post
    No. Just try adjusting the regulator either way and see what the pressure does. Is it an aftermarket pump? Did you rewire the pump? If so check the voltage at the pump.
    We tried adjusting the pump. No change. Voltage to pump is right. Has an aftermarket pump and has the rewire done.
    ZZP 10.4mm's, ZZP S2 IC, 3.4, 3.0, Ported Gen V, ZZP Headers, ZZP CNC Heads, ZZP 78mm TB, ZZP Aluminum Valve Covers, Meziere Electric WP, ZZP Fuel Pump, ZZP Fuel Logs, 65 Mototrons, 3.29's, 2500 Stall. Tuned by GLANZERGTX and Kyle. E85 Converted, 21* Timing
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  7. #7 Re: Low Fuel Pressure on first start up. HELP!! 
    bbptech
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    Default 01-30-2010
    Quote Originally Posted by jaysgtp360 View Post
    un hook fuel pressure regulator while watching FP. See what happens...should go to max while unhooked..48-53 should be normal at idle
    I took the vacuum line off the regulator while started and no chainge. stayed at 18 psi
    ZZP 10.4mm's, ZZP S2 IC, 3.4, 3.0, Ported Gen V, ZZP Headers, ZZP CNC Heads, ZZP 78mm TB, ZZP Aluminum Valve Covers, Meziere Electric WP, ZZP Fuel Pump, ZZP Fuel Logs, 65 Mototrons, 3.29's, 2500 Stall. Tuned by GLANZERGTX and Kyle. E85 Converted, 21* Timing
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  8. #8 Re: Low Fuel Pressure on first start up. HELP!! 
    Pittman06
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    Default 01-30-2010
    sounds like your pumps bad, what are you running for the pump
    F clean cars, I Ride Dirty!.....to hide the wicked body damage...
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  9. #9 Re: Low Fuel Pressure on first start up. HELP!! 
    TheOtherNick
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    Default 01-30-2010
    Quote Originally Posted by bbptech View Post
    I took the vacuum line off the regulator while started and no chainge. stayed at 18 psi
    Looks like the regulator is not working. Fuel pressure should go up with no vacuum at the regulator.
    01 gtp-big cam e85 dd 78dodge- guzzling fuel 05 cummins- rollin coal
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  10. #10 Re: Low Fuel Pressure on first start up. HELP!! 
    bbptech
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    Default 01-30-2010
    well i got the problem solved. Swapped in a canister that had a stock pump in it and fuel pressure is at a stable 45 psi.

    i either have hooked the zzp pump up wrong or its faulty.
    ZZP 10.4mm's, ZZP S2 IC, 3.4, 3.0, Ported Gen V, ZZP Headers, ZZP CNC Heads, ZZP 78mm TB, ZZP Aluminum Valve Covers, Meziere Electric WP, ZZP Fuel Pump, ZZP Fuel Logs, 65 Mototrons, 3.29's, 2500 Stall. Tuned by GLANZERGTX and Kyle. E85 Converted, 21* Timing
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  11. #11 Re: Low Fuel Pressure on first start up. HELP!! 
    jaysgtp360
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    Default 01-31-2010
    there was some issue with the tube that runs in the cannister....one of the 3800 aftermarket guys has a fix for this...If I remember correctly you have to use 97-98 cannisters for some aftermarket fuel pumps to work properly.....I don't have all the emails anymore...many Hard drives ago.....but I saw you had aftermarket pump and when you changed out cannisters all was good...I haven't seen one of these in a while as I have been dealing with transaxles.
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