Test NS-4B - Correcting Fuel Delivery
WARNING:
High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE procedure in this article. After each repair, perform TEST VER-1 .
- Ensure fuel tank is at least 1/4 full, and release fuel pressure. Turn ignition off. Remove fuel return hose from fuel rail tube. Connect a 6-foot fuel hose to fuel rail return tube. Put other end of 6-foot hose into an approved 2-gallon or more capacity gasoline container. Go to next step.
- Turn ignition on. Using DRB, actuate fuel system. Read fuel pressure gauge reading. If fuel pressure is more than 60 psi, replace fuel pressure regulator. If fuel pressure is less than 60 psi, go to next step.
- Turn ignition off. Reconnect fuel return hose. Remove fuel return hose from fuel tank. Connect Fuel Pressure Test Adapter (C-6541) to disconnected return hose. Put other end of hose into an approved 2-gallon or more capacity gasoline container. Go to next step.
- Turn ignition on. Using DRB, actuate fuel system. Read fuel pressure gauge. Using DRB, stop actuation test. If fuel pressure is less than 60 psi, repair or replace restricted fuel pump module. If fuel pressure is more than 60 psi, repair restricted fuel return line between fuel rail and fuel tank.