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GT Fuel Pump Amp Draw?

Discussion in 'Engine/Tuning' started by rotty421, Jun 1, 2009.

  1. rotty421

    rotty421 Member Established Member

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    What is the maximum amp draw rating for a dual GT fuel pump set up? What size wire would you use for a 20 foot run. Return style system if it matters.

    Thanks
     
  2. TwinTurbo4vGT

    TwinTurbo4vGT Slowest GT alive :) Established Member

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    ford GT pumps will draw about 20-22 Amps, your going to need 8awg wire for this
     
  3. SVT GI

    SVT GI Well-Known Member Established Member

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    ^^^ Yup, that is why you should have a 30 amp relay. I've seen guys run none or just one for both pumps but thats not for me. I have a 2-30 amp relays. And def 8ga main feed.
     
  4. Black Cobra

    Black Cobra New Member Established Member

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    Are we sure this 8 AWG recomendation isn't coming off a 110volt AC chart? Several sources I find for Automotive 12 volt DC; indicate that 10 AWG is the wire to use for 30 amps in the 15-30 foot range.

    I've installed an additional FPDM and haven't ran the wire from the battery yet. This is something I want to get right but I dont want overkill.

    Automotive Wire & Wiring Guide from TESSCO - TESSCO.com
    Here they show 10 AWG @ 30 amps good for 15', 20', and 25'; chart doesn't run out to 30'. They also show 8 AWG for 40-50 amps running 25' and short runs (5-10') of 150/200 amps.

    http://www.btc-bci.com/~billben/maxwire.pdf
    This pdf shows 10 AWG can run 60' @ 15 amps and 45' @ 20 amps. Doesn't show 30 amps; but if you use the 15 amp number then 30 amps would be around 30' half the length for twice the amps.
     
    Last edited: Aug 21, 2011
  5. Brutal Metal

    Brutal Metal Well-Known Member Established Member

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    Black Cobra you want 8 gauge NOT 10 for that NO Doubt!
    And yes the GT pumps have more current draw than the Oem,Aviator and SVT Focus pumps!
     
  6. Black306

    Black306 Active Member Established Member

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    As long as you have a good quality 10ga wire, it can be used with twin GT pumps. The catch is making sure it is good wire. The 10ga wire I'm using is designed for a continuous 30A load. If you're not sure of the rating, go 8ga. Even cheap 8ga wire should handle a continuous 30A load.

    A fuse is a must. I went an unconventional route; I added a circuit to the engine bay fuse panel. The slot I filled uses a MAXI fuse. :-D
     
  7. Brutal Metal

    Brutal Metal Well-Known Member Established Member

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    Derek I need to PM you or can you send me that link for wiring up the additional fpdm and what do I use to seal the top of the hat after the wire is run through it?
    Edit! oops I see the link in your Sig, Thanks!
     
    Last edited: Aug 22, 2011
  8. Black306

    Black306 Active Member Established Member

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    Well, I don't really have info in my article about running wires through a stock hat. The best way I've seen to run wires through a hat is found here: Stock fuel hat... Lethal dual FPDM kit..
     
  9. 46stang

    46stang Member Established Member

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    10 guage is enough but most prefer to use 8 guage for the safety margin. The pumps are pulse width modulated so the voltage and current will be low while cruising around. 10 guage wire isn't going to heat up if you do 1/4 mile stuff. If you are a road course guy and driving the car hard for extended periods of time than 8 guage may be a better choice just because then the pumps will be pulling more current longer. Also I would not recommend hooking up the FP relays so each relay operates the pumps individually. The reason I say that is because if one of the relays die you may not notice until the motor burns down from going lean due to it running on only one pump.
     
  10. cobracide

    cobracide Active Member Established Member

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    Reference..

    [​IMG]
     
  11. Brutal Metal

    Brutal Metal Well-Known Member Established Member

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    Thanks sir! Hey I noticed at the bottom of your FPDM link a method for wiring the 2nd fpdm that DOESN'T run the additional wire through the hat and not needing an additonal plug, would this be OK for my setup? Not planning on going over 550RW and not too concerned about splicing those wires, this car will not be put back to stock and if if does I'll worry about it then, haha!
     
  12. Black306

    Black306 Active Member Established Member

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    It doesn't seem like it in the picture, but there is an additional pair of wires running down to the hat for the 2nd pump. That pic was just to show what it could look like if a stand-alone harness wasn't used. Unfortunately, there is no way around skipping the additional pair of wires for a pump.
     
  13. Brutal Metal

    Brutal Metal Well-Known Member Established Member

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    Gotcha thanks I had a feeling that was the case, each pump needs a Module!
     
  14. SVT GT

    SVT GT New Member Established Member

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    tagged
     
  15. Quick Strike

    Quick Strike Well-Known Member Established Member

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    OP - GT pumps are made for a returnless system. You will need pumps made for a return style system if that is what you are doing.
     
    Last edited: Aug 23, 2011

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