Express 3/4 Ton Van V8-4.8L VIN V (2003)
Steps 23-25
The numbers below refer to the step numbers on the diagnostic table.
4. This step tests for an internal fuel leak.
5. This step tests the fuel pump check valve for a leak down condition.
6. This step tests the fuel pressure regulator.
10. This step tests for a loss of fuel pressure between the fuel feed pipe shut-off adapter and the fuel pump.
11. This step tests for a leaking fuel injector or for a leaking fuel pressure regulator.
14. This step tests for a restricted fuel return pipe.
16. This step determines if the fuel pressure regulator or the fuel pump is the cause of the low fuel pressure.
18. This step verifies that a circuit condition is not the cause of a fuel pressure concern.
