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Thread: Fuel Pump Wiring Question

  1. #1

    Default Fuel Pump Wiring Question

    Tried searching and didn't pull up exactly what I was looking for. My question is can you use the fuel pump trigger on the Terminator X to trigger a relay instead of wiring direct to the fuel pump. My pump pulls more amps than is suggested in the instructions.

  2. #2
    Join Date
    Dec 2009


    Yes. This is a copy & paste from one of my other posts:

    Originally Posted by Danny Cabral
    FYI: I've never used the ECU's fuel pump trigger wire to directly power the pump (even if it is less than 10 amps).
    I've always used a separate relay (shown below) because that green wire is still only 14 AWG.
    The 2nd fuel pump relay is used so the fuel injectors aren't subjected to the pump's amp draw.
    It's only a 20 amp fuse and it also feeds power to the fuel injectors (& ignition coils - LSx, MOD & HEMI).
    I prefer to use 10 gauge wire due to its long length, especially for high output race pumps.
    Simply use the green fuel pump wire (+12V) to trigger your additional fuel pump relay's coil (+) terminal #86.
    Click image for larger version. 

Name:	medium12-753.jpg 
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ID:	10709 (Holley 12-753 Fuel Pump Relay Kit)
    (Holley 12-753 Fuel Pump Relay Kit Instructions) (Quick Fuel 30-199QFT Fuel Pump Relay Kit) (Mr. Gasket 40100G Sealed Relay Kit) (Pico Wiring 5593PT Sealed Relay Kit)
    Delphi Metri-Pack 630 Pull-To-Seat female terminals for retrofitting to a sealed relay socket connector:
    #12033997 10/12 AWG (3.0 mm²), #12066614 14/16 AWG (2.0-1.0 mm²), #12020156 18/20 AWG (0.80-0.50 mm²)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  3. #3


    @PurePerformance: The instructions also say that the green wire can be used to trigger a relay in case your pump pulls a bigger load than what the green wire is rated for. Andrew

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