Test NF-3B - Checking Fuel System
WARNING:
High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE
.
- Using DRB-II, stop fuel system actuation test. Relieve fuel pressure. Ensure fuel tank is at least 1/4 full before proceeding. Remove fuel return line from fuel pump at fuel tank. Connect Fuel Pressure Test Adapter (6541) to fuel return line. Place other end of adapter hose into an approved 2-gallon gasoline can.
- Turn ignition on. Using DRB-II, actuate ASD fuel system test. Observe fuel pressure gauge. If fuel pressure is 35-45 psi, repair fuel return line for a restriction at fuel tank. Perform VERIFICATION TEST VER-2 . If fuel pressure is not 35-45 psi, stop ASD fuel system actuation test. Relieve fuel pressure.
- Reconnect fuel return line to fuel tank. Disconnect fuel return line from fuel rail. Attach fuel pressure test adapter to fuel return line fitting. Place other end of adapter hose into an approved 2-gallon gasoline can. Turn ignition on. Using DRB-II, actuate ASD fuel system test. Observe fuel pressure gauge.
- If fuel pressure is 35-45 psi, repair restricted fuel return line to fuel tank. Perform VERIFICATION TEST VER-2 . If fuel pressure is not 35-45 psi, check fuel damper line for restrictions. Replace fuel pressure damper line if necessary. Perform VERIFICATION TEST VER-2 . If damper line is free of restrictions, replace fuel pressure regulator. Perform VERIFICATION TEST VER-2 .