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Thread: Fuel Prime Initial Setup

  1. #1
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    Default Fuel Prime Initial Setup

    After the Sniper handheld told me to do a fuel prime, I did the fuel prime and fuel wouldn't stop coming out of my line, until I turn the ignition off. Is this normal? I had the fuel line going to a gas can. Good thing is I have good pressure. Looking on the bright side.

  2. #2
    Join Date
    Dec 2009
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    Connecticut
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    If you're using an MSD Digital 6AL CD ignition box with EFI, ensure the Rev Limiter Verification feature is disabled (LINK).
    The MSD Ready-To-Run Distributors (even without the MSD Digital CDI box): http://documents.msdperformance.com/...r_addendum.pdf (MSD Ready-To-Run Rev Limiter Addendum)
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  3. #3
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    Default

    Let me rephrase. I did not have the fuel line to the fuel inlet of the Sniper. I had the fuel line going to a gas can and I turned the ignition on and the fuel pump just kept going, forever until I turned the key off. This was my original question and is the normal. After some thinking I realize, and correct me if I'm wrong, but this is normal. If the fuel line was connected to the Sniper and not free flowing into a gas can it would have stopped. Please correct me if I'm wrong.

    I think I'm forgetting it's not mechanical, even though if I turn the engine over with a mechanical pump not hooked up to a carb, the fuel line would still pour gas everywhere also. What I wanted to do was simply clean the fuel line of any debris, but I should have turned the ignition off after a few seconds and repeated a few times correct?
    Last edited by RPnova; 02-08-2018 at 02:38 AM.

  4. #4
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    No, that's not normal. The Sniper EFI fuel system prime occurs 2.5 seconds after key-on, and should only last a few seconds. Then it runs the fuel pump again when the ECU receives an RPM signal.
    https://forums.holley.com/showthread...pump-blue-wire (Additional Information)
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  5. #5
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    I didn't think it was normal at the time. All the Holley videos I watched say the same thing, and I thought it would last a few seconds too, but fuel kept coming out. Any ideas what to check, potential ground problem with the new pump? Thinking back on tonight I realized I did not have my WBO2 installed or plugged into the harness. I don't think that could cause a problem, do you?
    Last edited by RPnova; 02-08-2018 at 03:47 AM.

  6. #6
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    Just fully install the EFI system as instructed and start there. Also, ensure there's a base calibration uploaded into the ECU with the Wizard.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  7. #7
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    I know it loaded a base calibration because I pushed start then the handheld told me to cycle the ignition. Then I don't I think turned the ignition off. I think I went straight to the run position. That's what I did. I don't remember the handheld loading again. I thought I was doing a fuel prime, not an ignition cycle.
    Last edited by RPnova; 02-08-2018 at 04:31 AM.

  8. #8
    Join Date
    Dec 2017
    Location
    Hollister, CA
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    I just finished my installation a few days ago. After driving for a bit to let the Sniper EFI Learn, I had the bright idea to hit the firmware update button. I don't believe it did anything to change the firmware, but it did wipe out my initial calibration. After the fact, I read the part about how to download the current ECU calibration, which I should have done before hitting the FW update button (DOH!!!), so back to square one.
    More to the point, I noticed the same thing that the fuel pump ran continuously when the ECU did not have a current calibration uploaded. After setting up a calibration with the Wizard and cycling the power, all was good again and the pump cycled as it should. Good luck! Kevin

  9. #9
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    Default

    Good info, thanks Kevin!

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