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
PCM energizes HO2S heater element and fuel pump using fuel pump relay. Fuel pump relay is located in the power distribution center. For fuel pump relay location within PDC, refer to PDC cover label. Fuel pump relay coil is powered when ignition switch is in Run or Start position. Fuel pump relay is controlled by the PCM switching relay coil ground on and off.
The fuel pump circuit is completed during cranking and whenever the engine is running. If the ignition switch is turned to the RUN position, the fuel pump will operate for 1-3 seconds and then shut off. If the PCM does not receive a crank or run signal, it deactivates the fuel pump by opening the relay coil ground circuit. The 1-3 second time limit is used to prevent unnecessary operation of the fuel pump once the system is pressurized. If the engine were running, the PCM would maintain the fuel pump relay coil ground allowing continuous operation of the fuel pump.
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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.