Find the wiring diagram for the fuel pump on your 1990 Chevy 1500 and troubleshoot any issues with fuel delivery.. The document contains wiring diagrams for a 1990 Chevrolet Pickup K1500 truck. It includes 7 figures that show the wiring for the engine compartment and headlights, electronic control module for both gas and diesel engines, fuse block, wiper/washer and convenience center, instrument cluster, air conditioning/heating and power windows, and taillights. The diagrams are intended to assist with.

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Need a wiring diagram for the fuel pump in a 1990 Chevy 1500? Get all the information you need to properly diagnose and troubleshoot your fuel pump wiring with our detailed diagram. Order now and get your 1990 Chevy 1500 back on the road in no time!. Customer: I have a 1990 Chevy 1500 with a 5.7 TBI engine. My fuel pump isn't running at all. I removed an auxiliary harness yesterday, and since then, my truck won't start, and the fuel pump doesn't turn on. I noticed a connector with three wires—brown, black, and white—that is unplugged. Could this be the issue, and if so, where does it connect?