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 DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - 3.3L GASOLINENO-START TESTSTEST NS-4B - CORRECTING FUEL DELIVERY
1994 Plymouth Grand Voyager Base, 31TH
Test NS-4B - Correcting Fuel Delivery
1994 Plymouth Grand Voyager Base, 31THSECTION 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.
- Ensure fuel tank is at least 1/4 full. Release fuel pressure. Turn ignition off. Disconnect fuel return line from fuel pressure regulator. Connect Fuel Pressure Test Adapter (6541) to fuel return line. Place other end of adapter hose into an approved 2-gallon gasoline can.
- Turn ignition on. Using DRB, actuate fuel system. Read fuel pressure gauge. If pressure is less than 53 psi (3.7 kg/cm2 ), go to next step. If pressure is more than 53 psi (3.7 kg/cm2 ), turn ignition off. Inspect return line for restriction. Replace return line if required. Perform TEST VER-1 . If return line is okay, replace fuel pressure regulator. Perform TEST VER-1.
- Stop fuel system actuation. 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 adapter hose into an approved 2-gallon or more capacity gasoline container.
- Turn ignition on. Using DRB, actuate fuel system. Read fuel pressure gauge. Using DRB, stop actuation test. If pressure is less than 53 psi (3.7 kg/cm2 ), repair restricted fuel pump. Perform TEST VER-1. If pressure is more than 53 psi (3.7 kg/cm2 ), repair restricted fuel return line between fuel rail and fuel tank. 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.