Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPLYMOUTH1994GRAND VOYAGER BASE, 31THREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - 3.8LNO-START TESTSTEST NS-4A - REPAIRING LOW FUEL PRESSURE
1994 Plymouth Grand Voyager Base, 31TH
Test NS-4A - Repairing Low Fuel Pressure
1994 Plymouth Grand Voyager Base, 31THSECTION Test NS-4A - Repairing Low Fuel Pressure
WARNING:
High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE
procedure in this article.
- 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 DRB, 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 DRB, actuate fuel system. Observe fuel pressure gauge while gently squeezing fuel return hose. Using DRB, stop actuation test. If fuel pressure exceeded 43 psi (3.0 kg/cm2 ), replace fuel pressure regulator. Perform TEST VER-1. If fuel pressure did not exceed 4.3 psi (3.0 kg/cm2 ), replace fuel pump and sock filter. Perform TEST VER-1.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.