Fuel Supply System Check

This procedure will check for plugged fuel filter and lift pump operation.

1. Install a tee adapter at the injection pump fuel inlet connection.

2. Connect a pressure gauge with a dial indication of 0 to 103 kPa (0 to 15 psi) to the tee adapter.

3. Idle engine and measure fuel pressure.

- If pressure is 3 psi minimum, go to Step 4.

- If pressure is less than 3 psi. check for plugged fuel filter and refer to "Fuel Pump Relay Circuit Diagnosis" before replacing lift pump.

4. Remove pressure gauge and tee adapter.

5. Reconnect the fuel feed inlet to injection pump.

6. Clean any fuel spillage.

7. Run the engine and check for fuel leakage.

Fuel Pump Relay Circuit Diagnosis: