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Thread: Fuel Pump Prime

  1. #1

    Default Fuel Pump Prime

    Will increasing the fuel pump prime make it crank easier? What do most of you have yours set at? I have a 302, mild cam, it's got the Sniper EFI on it.

  2. #2
    Join Date
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    Default

    Quote Originally Posted by Road_block View Post
    Will increasing the fuel pump prime make it crank easier?
    I suppose if it optimizes the "cranking air/fuel ratio", it'll crank faster to start.

    What do most of you have yours set at?
    If you're referring to the "Fuel Prime Percent", 150-200% is usually good for big blocks, and 100-150% is usually good for small blocks.
    http://documents.holley.com/techlibrary_199r11259.pdf (Holley Sniper EFI Help Manual - EFI Software, Tuning & Datalogging)
    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

    Default

    OK I'll try less first. Might be too much at 150%, if 100-150% is better for small blocks. Better less and not flood it, than too much and flood it right?

  4. #4
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    Default

    I doubt you're actually "flooding" the engine with fuel.
    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

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