Chart A-7, Fuel System Pressure Test: Notes

Fuel pump delivers fuel to fuel rail and fuel injectors, where fuel pressure is maintained by pressure regulator.

1. Release fuel pressure before disconnecting fuel lines. Operate fuel pump by installing fused jumper wire between Black/White and Pink/Black wire terminals on fuel pump relay and turning ignition on. Fuel pump relay is mounted on ECM, located under left side of instrument panel, near kick panel.
2. Restricted fuel flow can cause fuel pressure to decrease, resulting in driveability problem.
3. Restricting fuel return hose allows fuel pump to obtain maximum fuel pressure. With ignition on, fuel pressure should be greater than 56.9 psi (4.0 kg/cm² ).
4. This determines if high fuel pressure is caused by fuel hose restriction or defective pressure regulator.
5. This checks for a leaking pressure regulator.