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Fuel Pump Question

Dedicated forum for all things electrical... Sometimes Electrical issues can really get you stumped! Not Stroker related.
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Powerkraut
Posts: 4
Joined: July 28th, 2017, 4:16 pm
Stroker Displacement: 4.6l
Vehicle Year: 1990
Vehicle Make: jeep
Vehicle Model: wrangler

Fuel Pump Question

Post by Powerkraut » August 20th, 2017, 7:15 am

Does anyone have a wiring diagram that shows the whole fuel pump circuit for a 94 yj? My pump isn't priming with the key in the on position, the ECU comes on with the key in the on position, all relays and fuses are new. Given that this problem only seems to happen intermittently I'm thinking that it's a bad ECU, but I want to try to run down any loose connections before replacing the computer.

jsawduste
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Posts: 969
Joined: February 28th, 2008, 3:13 am
Stroker Displacement: 4.9
Location: Michigan

Re: Fuel Pump Question

Post by jsawduste » August 20th, 2017, 12:49 pm

The fuel pump relay gets its switched power via the ASD relay output.
The fuel pump relay is grounded by the ECM
The ASD/fuel pump relay is triggered by the ignition switch in ign. III and IV (run start)
The fuel pump relay power feed has its own fuse in the PDC.

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