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post #1 of 3 Old 04-09-2012, 08:54 PM Thread Starter
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wireing external fuel pump

I going to be running a relay for my fuel pump and one of the wires is supposed to go to a switched 12v source. Question is can I take the wire from the factory harness that gave power to the fuel pump and run it to the relay for the switched source that way it still comes on with the key? If so does anyone know what wire it is? Car is an 89. Also im trying to find a sending unit for my fuel cell to work with the stock guage what ohm sending unit should I be looking for.

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post #2 of 3 Old 04-09-2012, 09:04 PM
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Wire the relay like this:

85 to Ground
30 to 12v Constant
86 to your ignition sourced fuel pump wire on the factory wiring.
87 out to your new fuel pumps 12v ignition input.

This will provide a high current output to your new pump, and the relay is switched on/off by ignition.

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post #3 of 3 Old 04-09-2012, 10:25 PM Thread Starter
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Do all relays have those numbers? Im using a magnafuel protuner 625. I dont have a relay yet I was going to buy the one from magnafuel and it just has colored wires no numbers.
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