Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fuel Pump Relay
This 4 or 5-terminal relay is located in underhood fuse/relay box. Fuel pump relay is used to power in-tank fuel pump. When ignition is turned to ON position, fuel pump relay sends signal to in-tank fuel pump for 2 seconds. When engine is started PCM receives signal from ignition control module (Passport, Rodeo and Rodeo Sport) or 58X reference signal (Axiom and Trooper). PCM signals fuel pump relay to operate in-tank fuel pump. For terminal identification, see appropriate wiring diagram in WIRING DIAGRAMS article. For testing procedure, see RELAY TESTunder MISCELLANEOUS TESTin appropriate SELF-DIAGNOSTICS article.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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