Correcting Fuel Delivery
WARNING:
High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE
.
NOTE:
After each repair, perform TEST VER-1
.
- Record fuel pressure gauge reading. Turn ignition off. Release fuel pressure. Remove fuel pressure gauge. Install fuel pressure gauge between fuel tank and fuel filter. Turn ignition on. Go to next step.
- Using scan tool, actuate Auto Shutdown (ASD) fuel system. Record fuel pressure gauge reading. Compare fuel pressure gauge reading with previous reading. If fuel pressure gauge reading is not at least 10 psi more than previous reading, go to step 4). If fuel pressure gauge reading is at least 10 psi more than previous reading, go to next step.
- Turn ignition off. Inspect fuel lines between fuel filter and fuel rail for restriction. Repair as required. If no restrictions are observed, replace fuel filter.
- If fuel pressure gauge reading is not at least 10 psi more than previous reading in step 2), turn ignition off. Release fuel pressure. Disconnect fuel return hose at fuel rail tube. Connect a 6-foot fuel hose to fuel rail return tube. Put other end of 6-foot fuel hose into an approved 2-gallon or more capacity fuel container. Go to next step.CAUTION: DO NOT allow fuel pressure to exceed 70 psi when squeezing fuel hose.
- Turn ignition on. Using scan tool, actuate fuel system. Gently squeeze 6-foot fuel hose. Read fuel pressure gauge reading. Using scan tool, stop fuel system actuation test. If fuel pressure exceeds 50 psi, replace fuel pressure regulator. If fuel pressure does not exceed 50 psi, replace fuel pump and sock filter.