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Old 07-06-2018, 11:59 AM   #13
Kingtal0n
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I used to think all factory ECU ground a pin for turning things on and off. It just seemed safer.

But one day I ran into a computer that was throwing 12v. so they can do either.

I don't recall which the factory ecu does but it isn't difficult to test with a $5 multi meter from Harbor freight. Also you can easily reverse the order by using another relay. Since most fuel pump high performance installs need larger 12v wires anyways, its fairly common to use the existing fuel pump 12V feed wire to simple trigger a relay near the pump that pulls on a much larger 12v wire to feed the actual pump.
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