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 System Test
- Turn ignition on. With fingers, pinch fuel feed hose at fuel filter. Fuel pressure pulsation should be felt for 5 seconds after ignition is turned on. If pulsation is not felt, go to next step. If pulsation is felt, system is functioning properly.
- Turn ignition off. Disconnect fuel pump relay. Fuel pump relay is located in relay box, on right front inner fender panel. Turn ignition on. Measure voltage between ground and fuel pump relay harness connector terminals No. 2 (Black/Yellow wire) and No. 3 (Black/Yellow wire). Battery voltage should be present. If battery voltage is present, go to next step. If battery voltage is not present, check 15-amp fuse No. 17 in fuse box. Check harness continuity between fuses and fuel pump relay. Repair or replace as necessary.
- Turn ignition off. Disconnect fuel pump harness connector. Check continuity as follows:
- Between fuel pump relay harness connector terminal No. 5 (White/Blue wire) and fuel pump harness connector terminal No. 1 (White/Blue wire).
- Between fuel pump harness connector terminal No. 1 and body ground.
Continuity should exist in both checks. If continuity exists in both checks, go to next step. If continuity does not exist in either check, repair appropriate harness or connectors.
- Check fuel pump relay. See RELAYS under RELAYS & SOLENOIDS. Also check fuel pump. See FUEL PUMP. If necessary, replace fuel pump relay or fuel pump. If fuel pump relay and fuel pump are okay, disconnect and inspect harness and connectors for pushed-out, bent, damaged or corroded terminals. Repair harness or connectors as necessary.
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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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