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-5, Fuel Pump Relay: Notes
With ignition on, the ECM activates fuel pump relay, which energizes the in-tank electric fuel pump. The fuel pump operates as long as ECM receives an ignition reference pulse. If there is no ignition reference pulse, fuel pump stops within 2 seconds. If fuel pump relay or ECM fails while engine is running, the fuel pump continues to run through an oil pressure switch back-up circuit.
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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.