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 MANUALSJEEP1994CHEROKEE COUNTRY, 2D UTILITY, RWD, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - 2.5L & 4.0LNO-START TESTSTEST NS-4A - CORRECTING FUEL DELIVERY
1994 Jeep Cherokee Country, 2D Utility, RWD, Standard
Test NS-4A - Correcting Fuel Delivery
1994 Jeep Cherokee Country, 2D Utility, RWD, StandardSECTION Test NS-4A - 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.
- 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 greater than previous reading, go to step 4). If fuel pressure gauge reading is at least 10 psi greater than previous reading, turn ignition off.
- Inspect fuel lines between fuel filter and fuel rail for restriction. Repair as necessary. Perform TEST VER-1. If no restrictions are observed, replace fuel filter. Perform TEST VER-1.
- Disconnect fuel return hose at fuel rail. Connect a 6-foot fuel hose to fuel rail. Put other end of 6-foot hose into an approved 2-gallon or more capacity gasoline container. Turn ignition on. Using DRB, actuate fuel system.CAUTION: DO NOT allow fuel pressure to exceed 100 psi (7.0 kg/cm2 ) when squeezing fuel return hose.
- Gently squeeze fuel return hose. Read fuel pressure gauge. Using DRB, stop fuel system actuation test. If pressure is greater than 34 psi (2.3 kg/cm2 ), replace fuel pressure regulator. Perform TEST VER-1. If it is less than 34 psi (2.3 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.