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.
Chart A-7A, Fuel Pump Relay Check: Notes
With ignition on, ECM energizes fuel pump relay for 3 seconds, allowing for fuel pump operation. When fuel pump relay is de-energized, fuel pump stops operating. If engine is being cranked or is running, fuel pump will continue to operate as long as ECM is receiving ignition reference pulses. If ignition reference pulses are not detected, fuel pump will stop after 3 seconds.
- Checks fuel pump operation with ignition switch in ON position.
- Checks fuel pump relay switch for power.
- Checks for faulty ECM and improper fuel pressure.
- Checks for fuel pump circuit.
- Checks for open in Pink wire from fuel pump relay to fuel pump.
- Checks for faulty fuel pump relay coil for power.
- Checks for faulty fuel pump or an open in Black wire (ground).
- Checks for faulty fuel pump relay.
- Checks for faulty ECM or an open in Pink/White wire from fuel pump relay to ECM.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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