Test NS-4A - Repairing Low Fuel Pressure
WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE
procedure in this article in the ENGINE PERFORMANCE section.
- 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.
- 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, turn ignition off.
- Inspect fuel lines between fuel filter and fuel rail for restriction. Repair as required. Perform TEST VER-1. If no restrictions are observed, replace fuel filter. Perform TEST VER-1.
- Release fuel pressure. Remove fuel pressure gauge. Reinstall fuel line. Install fuel pressure gauge to fuel port. Disconnect fuel pressure regulator return hose. Connect Fuel Pressure Test Adapter (6541) to disconnected hose. Place other end of adapter hose into an approved 2-gallon gasoline can. Turn ignition on.CAUTION: DO NOT allow fuel pressure to exceed 70 psi (4.9 kg/cm2 ) when squeezing fuel return hose.
- Using scan tool, actuate fuel system. Observe fuel pressure gauge while gently squeezing fuel return hose. Using scan tool, stop actuation test. If fuel pressure exceeds 43 psi (3.0 kg/cm2 ), replace fuel pressure regulator. Perform TEST VER-1. If fuel pressure does not exceed 4.3 psi (3.0 kg/cm2 ), replace fuel pump and sock filter. Perform TEST VER-1.