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 in fuel supply line at throttle body. Turn ignition switch to ON position. Using DRB-II, actuate fuel system test. If fuel pressure is 12-16 psi (AN body) or 35-45 psi (AS body), test is complete. If fuel pressure is not 12-16 psi (AN body) or 35-45 psi (AS body), go to next step.
- Check if fuel pressure is more than 16 psi (AN body) or 45 psi (AS body). If fuel pressure is more than 16 psi (AN body) or 45 psi (AS body), perform TEST NF-3B - CHECKING FUEL PRESSURE . If fuel pressure is less than 16 psi (AN body) or 45 psi (AS body), go to next step.
- Using DRB-II, stop fuel system actuation test. Turn ignition switch to OFF position. Inspect fuel lines for kinks and restrictions. Repair as necessary. Perform VERIFICATION TEST VER-2 . If fuel lines are okay, go to next step.
- Relieve fuel pressure. Remove fuel pressure gauge from supply line. Install fuel pressure gauge between fuel tank and fuel filter. Turn ignition switch to ON position. Using DRB-II, actuate fuel system test. If fuel pressure is more than 16 psi (AN body) or 35 psi (AS body), replace fuel filter. Perform VERIFICATION TEST VER-2
. If fuel pressure is less than 16 psi (AN body) or 35 psi (AS body), go to next step.CAUTION: DO NOT allow fuel pressure to exceed 50 psi when squeezing fuel return hose.
- 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 .