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Thread: Fuel Pump Relay

  1. #1

    Default Fuel Pump Relay

    The instructions say connect one of the red wires to the pump, and the other to the battery. Does it make a difference which one?

  2. #2
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    Quote Originally Posted by ssenay72 View Post
    The instructions say connect one of the red wires to the pump, and the other to the battery.
    Which instructions? The 534-134 fuel pump relay kit?

    Does it make a difference which one?
    I need to know which Holley product you're referring to.
    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

    Part Number 12-753
    6. Connect one of the Red wires to the Positive wire (Red on Holley pumps) of the fuel pump.
    7. Attach the in-line fuse holder to the remaining Red wire. After attaching the fuse holder, insert 15A fuse and connect to the positive side of battery.
    The other thing I noticed is it's constantly running now. Where as before with the harness trigger wire, it would "prime" & stop. That normal?

  4. #4
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    Quote Originally Posted by ssenay72 View Post
    Part Number 12-753
    It doesn't necessarily matter because terminals #30 & #87 can be reversed.
    However, it's preferred to wire the fuse before the relay, so it's also protected.
    http://forums.holley.com/showthread....Fan-Holley-EFI (See relay wiring at center of page.)

    The other thing I noticed is it's constantly running now. Where as before with the harness trigger wire, it would "prime" & stop. That normal?
    That's because the additional Fuel Pump Relay is wired slightly differently, if operated by the Holley EFI system.
    The (+12V) green fuel pump wire from the Holley EFI System Relay, now energizes the Fuel Pump Relay (green/black wire).
    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

    Default

    Yeah, I wired the fuse in. OK, guess I'm all set then, thanks.

  6. #6
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    Quote Originally Posted by ssenay72 View Post
    Yeah, I wired the fuse in.
    I realize you wired the fuse in...it's used in both wiring methods. It's how the relay's coil is wired (triggered), that implements the 5 second Fuel Pump Prime time.
    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

    Default

    I think I follow you here. So instead of running the green from the relay to switched +12V, use the Holley trigger wire instead?

  8. #8
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    Quote Originally Posted by ssenay72 View Post
    So instead of running the green from the relay to switched +12V, use the Holley trigger wire instead?
    Instead of connecting the green/black wire (from the 12-753 Fuel Pump Relay Kit) to switched +12V, connect it to the Holley EFI green fuel pump wire.
    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

  9. #9

    Default Green & Black Relay Wires

    Got to looking at my 12-753 fuel pump relay kit. The #86 terminal has the black wire and #85 terminal has the green wire. My question, do I still put green wire to the Holley EFI green fuel pump wire? The paper come with it shows that #85 terminal goes to ground. Thanks for any help.

  10. #10
    Join Date
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    The Holley EFI green fuel pump wire triggers the green/black switched +12V relay wire.
    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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