Bonneville V8-4.6L VIN Y (2004)
Steps 20-26
The numbers below refer to the step numbers on the diagnostic table.
2. This step verifies that the fuel pump is operating.
4. This step tests for an internal fuel leak.
6. This step tests the fuel pressure regulator.
9. This step inspects the fuel pressure regulator for a fuel leak from the vacuum port.
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 fuel pressure regulator.
14. This step tests for a restricted fuel return pipe.
18. This step verifies that a circuit condition is not the cause of a fuel pressure concern.
16. This step determines if the fuel pressure regulator, or the fuel pump, is the cause of the low fuel pressure.
