1993 Chevy Truck Fuel supply wiring

BATTYUSA

MEMBER
1993 CHEVROLET TRUCK

Electrical problem
1993 Chevy Truck V8 Two Wheel Drive Automatic

Have fuel pump issues. No pump function. Just got truck. Pump was said to be replaced. Found: Tank not properly mounted, junk pump in tank, dirty tank, disconnected harness (Pump B- was not even bolted to frame) at ank, no supply at tank harness, missing (5PIN- not typical Bosche) relay on pass side firewall next to buss panel. I dropped tank, drained, cleaned replaced pump and send unit, checked operation out of tank and in tank. Unit works now with external power source. Need wiring diagram and location of fuel pump relay and associated parts. Found 2 relays under dash.1 is flasher. I suspect other is Low/High headlights. If fuel pump is other than above mentioned relay Pls advise function of above and location of fuel pump relay. Any other tipps would be appreciated Once I get the diagram I'm sure I can figure out the rest. Thx.(^^)

1 Reply

JDL

MECHANIC
16,098 POSTS

Compare the wiring colors at the connector. My info shows the relay to be located on the firewall a little to the passenger side, fuel pump fuse next to it. The computer sends voltage to the control side of relay on the green wire white tracer. Black is ground, red is for the prime connector, orange is B+ for the load side of relay, Gray supplies voltage to fuel pump when relay is energized.

The autozone site has diagrams, click on (vehicle repair guides) and follow the links.