Short answer: wire the fuel pump with a proper relay, appropriate fuse, clean grounds, and a control trigger (often ECU/PCM fuel pump output). Most fuel pump issues in swaps come from undersized wire, weak grounds, and “temporary” wiring that becomes permanent.

“If you want EFI reliability, wire it like a modern vehicle — not like a weekend test.”

The Builder-First Priorities

• Relay control: high current should not run through small switches
• Proper fusing: protect the circuit close to the power source
• Correct wire gauge: sized for pump draw and length
• Clean grounding: dedicated grounds beat “frame guesses”
• Serviceability: route and label wiring so you can diagnose later

Common Mistakes

• Skipping a relay and overheating a switch or trigger wire
• Grounding to paint/rust and creating intermittent pump operation
• Using cheap connectors that corrode or loosen over time
• Routing power too close to exhaust heat

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