Test Description

The numbers below refer to the step numbers in the testing procedure.

1. 4 -  This step tests for an internal fuel leak.
2. 5 -  This step tests the fuel pump check valve for a leak down condition.
3. 6 -  This step tests the fuel pressure regulator.
4. 10 -  This step tests for a loss of fuel pressure between the fuel feed pipe shut-off adapter and the fuel pump.
5. 11 -  This step tests for a leaking fuel injector or for a leaking fuel pressure regulator.
6. 14 -  This step tests for a restricted fuel return pipe.
7. 16 -  This step determines if the fuel pressure regulator or the fuel pump is the cause of the low fuel pressure.
8. 18 -  This step verifies that a circuit condition is not the cause of a fuel pressure concern.