Test NS-4E - Repairing High Fuel Pressure
WARNING:
High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE .
- Turn ignition off. Ensure fuel tank is at least 1/4 full before performing this test. Release fuel pressure. Disconnect fuel return hose at fuel rail. Connect a 6 foot fuel hose to fuel rail. Place other end of 6 foot fuel hose into an approved 2 gallon or more capacity fuel container. Go to next step.
- Turn ignition on. Using scan tool, actuate ASD fuel system and observe fuel pressure gauge. Using scan tool, stop ASD fuel system actuation. If fuel pressure was less than 53 psi (3.7 kg/cm2 ), go to next step. If fuel pressure was 53 psi (3.7 kg/cm2 ) or more, replace fuel pressure regulator. Perform TEST VER-1A.
- Turn ignition off. Reconnect fuel return hose. Remove fuel return hose from fuel tank. Connect Hose (C6541) to disconnected fuel return hose at fuel tank. Put other end of hose into an approved 2 gallon or more capacity fuel container. Go to next step.
- Turn ignition on. Using scan tool, actuate ASD fuel system. Using scan tool, actuate ASD fuel system and observe fuel pressure gauge. Using scan tool, stop ASD fuel system actuation. Go to next step.
- If fuel pressure was less than 53 psi (3.7 kg/cm2 ), repair or replace restricted fuel pump module. Perform TEST VER-1A. If fuel pressure was 53 psi (3.7 kg/cm2 ) or more, repair restricted fuel return line between fuel rail and fuel tank. Perform TEST VER-1A.