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Old 05-17-2009, 04:12 PM
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Elect. fuel pump wiring help?

Hi eveyone, I have a '66 mustang I am ready to drop a '90 5.0 HO and AOD tranny (that I have rebuilt) into in about a week. I finally wore out the old 302/3 speed toploader...lol. I am wondering how to get the electric fuel pump wired in with my ezwiring harness that i installed about a year ago. I have the original efi wiring harness (going to stay with the efi stuff) and the computer. So, I need to inegrate the fuel pump wire from the computer and the ezwiring harness wire (fused from the main fuse box) to a relay and also include the inertia switch that i am installing into the trunk. I need the ezwiring harness wire to give it power and the computer wire to tell it when to go on and off if i crank the car, and of course the inertia switch to keep me from going up in a ball of flame if I get hit from behind and roll or something to keep the fuel from continuing to flow. I would like to use a relay to power all of this...Whew, that's a mouthful! Thanks for any help and a diagram showing a relay and hookup would be most appreciated. I am electrically challanged...lol. Thanks, gary.

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Old 05-17-2009, 05:13 PM
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Here is my favorite relay wiring link, http://www.6066gmcguy.org/BoschRelay.htm
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Old 05-19-2009, 04:08 PM
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That's a good one, thanks!
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Old 05-20-2009, 10:37 AM
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wiring diagram

Try this wiring, Gary. I assumed the EZ wire and the computer wire go high (+12volts) when on. I assumed the inertia switch is closed until a crash happens and then it opens. Make sure to observe the + and ground terminals of the pump. Lemme know if you have questions.
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Old 05-21-2009, 11:57 AM
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Thanks so much for taking time to draw this for me. Helps a lot! Thanks, gary.

Here's my 66 it's going in. I did all the body/paint everything!






This is my '56 cheby pickup I also restored for my youngest son to drive when he turned 16.


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Old 05-21-2009, 11:59 AM
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Forgot to add, that's correct about the +12v on both. Thanks, gary.
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Old 05-22-2009, 12:10 AM
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Electric Fuel Pump Wiring?
I'm going to mount an electric fuel pump on the rear frame and I need a 3 amp electrical connection. I was thinking of maybe hooking up the pump to the fuel level sending unit electrical wires since those will no longer be needed with my fuel cell. Is that connection hot when the ignition is turned on? Does it have enough electrical capacity? How have some of you hooked up an electric fuel pump? This is for a drag racing application.
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Old 05-22-2009, 09:24 AM
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Quote:
Originally Posted by Emmanuel89
Electric Fuel Pump Wiring?
I'm going to mount an electric fuel pump on the rear frame and I need a 3 amp electrical connection. I was thinking of maybe hooking up the pump to the fuel level sending unit electrical wires since those will no longer be needed with my fuel cell. Is that connection hot when the ignition is turned on? Does it have enough electrical capacity? How have some of you hooked up an electric fuel pump? This is for a drag racing application.
Thanks.
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The sender usually has two wires. One goes to the fuel gauge and the other goes to a ground. Neither of these are +12. Recommend a pair of 12 or 14 gauge wires from the pump, one to battery ground (I never use the frame for ground) and the hot wire thru a relay directly to battery positive. Use the IGN connection or a separate toggle switch to control the relay. Lemme know if you have questions. Good racing!
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