I'm ready to start my truck but I don't seem to be getting any power to the fuel pump. I switched the pink/black wire from the old relay to the new one coming from the new computer. I don't get power at the in line fuse under the hood. Did I forget something? Do I need to connect it differently?
I don't have a pressure at my gauge and I don't hear it prime. Does the oil pressure switch from the old comp not being hooked up effect it?
Its a 91 c1500 by the way.
Oil pressure switch mattered on a stock 91 but as to a swap someone else needs to answer.
I would run a new relay, get rid of the oil pressure thing.
pin 85 - pcm
pin 86 - battery/ignition
pin 87 - battery fused
pin 30 - fuel pump power
you can switch 85/86 and 87/30.
just be sure you have power and the relay is triggering.
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I received a new relay with the new harness. I connected a wire that said fuel pump 12v+ to switched power. It only had 4 wires on the new relay comppared to the stock one having 5. So I took the one going to the pump itself (pink/black) and pinned it in the open spot on the new relay. Same spot as the stock one. The other 3 I didn't touch cause it looked like they went to the pcm
What fuel pump system did you go with?
right now im running the stock pump and lines. so for everything is holding up. if it burns out then ill cross that bridge when i get there. i do have an adjustable fpr though
Sounds good. I take it, you worked out your fuel pump relay wiring issue.Originally Posted by passaphist
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