Test NF-3A - Checking Fuel Pressure
WARNING:
High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE
.
- Relieve fuel pressure. Connect fuel pressure gauge to fuel rail. Turn ignition on. Using DRB-II, actuate ASD fuel system test. If fuel pressure is 35-45 psi, test is complete. If fuel pressure is not 35-45 psi, record fuel pressure reading. If pressure is more than 45 psi, perform TEST NF-3B.
- If fuel pressure is less than 45 psi, stop ASD fuel system actuation test. Turn ignition off. Inspect fuel lines for kinks or restrictions. Repair fuel lines as necessary. Perform VERIFICATION TEST VER-2 . If lines are not kinked or restricted, release fuel pressure. Remove fuel pressure gauge.
- Install fuel pressure gauge between fuel tank and fuel filter. Turn ignition on. Using DRB-II, actuate ASD fuel system test. If fuel pressure is at least 5 psi more than recorded fuel pressure, in step 1), replace fuel filter. Perform VERIFICATION TEST VER-2
.CAUTION: DO NOT allow fuel pressure to exceed 50 psi in step 4).
- If fuel pressure is not at least 5 psi more than recorded fuel pressure, gently squeeze fuel return hose while observing fuel pressure gauge. If fuel pressure increases, replace fuel pressure regulator. Perform VERIFICATION TEST VER-2 . If fuel pressure does not increase, replace fuel pump and sock assembly. Perform VERIFICATION TEST VER-2 .