Fuel Pump: Testing and Inspection

1. With the ignition switch OFF, disconnect the coupler from the main relay behind the fuse box.
2. Connect the yellow/black wire and black/yellow wire with a jumper wire.
3. Relieve fuel pressure and disconnect the fuel return hose from the regulator.






4. Turn the ignition switch ON, measure the amount of fuel flow for 10 seconds, then turn the ignition switch OFF.
5. If fuel flow is less than 230cc (7.8 oz.), or there is no fuel flow, check for:

- Fuel pump failure
- Clogged fuel filter
- Clogged fuel line
- Pressure regulator failure

6. To check fuel pump jack up car and place on jackstands.






7. With the ignition switch OFF, remove the fuel pump cover and disconnect the coupler.
8. Check that battery voltage is available at the fuel pump wire couplers when the ignition switch is turned ON with the positive probe to the yellow/black wire, negative probe to the black wire.
9. If battery voltage is available, replace the fuel pump, if there is no voltage, check the main relay and wire harness.