- Check all hoses and lines for kinks and leaking. Repair as necessary.
- Check all electrical connections for looseness and corrosion. Repair as necessary.
- Turn the ignition key from the OFF position to the RUN position several times (do not start the engine) and verify that the pump runs briefly each time, (you will here a low humming sound from the fuel tank).
Check that the inertia switch is reset before diagnosing power supply problems to the fuel pump.
The use of a scan tool is required to perform these tests.
- Turn the ignition key OFF .
- Connect a suitable fuel pressure gauge to the fuel test port (Schrader valve) on the fuel rail.
- Connect the scan tool and turn the ignition key ON but do not start the engine.
- Following the scan tool manufacturer's instructions, enter the output test mode and run the fuel pump to obtain the maximum fuel pressure.
- The fuel pressure should be between 30-45 psi (210-310 kPa).
- If the fuel pressure is within specification the pump is working properly. If not, continue with the test.
- Check the pump ground connection and service as necessary.
- Turn the ignition key ON .
- Using the scan tool, enter output test mode and turn on the fuel pump circuit.
- Using a Digital Volt Ohmmeter (DVOM), check for voltage (approximately 10.5 volts) at the fuel pump electrical connector.
- If the pump is getting a good voltage supply, the ground connection is good and the fuel pressure is not within specification, then replace the pump.
REMOVAL & INSTALLATION
See fuel pump under fuel tank in this section.