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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 24 (Engine Controls - Tests W/Codes - 2.5L) >> No-Start Tests >> Test NS-2A - Inspecting Fuel System

Test NS-2A - Inspecting Fuel System

WARNING: This page is about a different car, the 1995 Dodge Dakota. 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.
  1. Ensure throttle cables are not holding throttle open. If throttle is held open, repair as required. Perform TEST VER-1. If throttle is not held open, using scan tool, read Throttle Position (TP) sensor voltage.
  2. If voltage is less than 1.5 volts, go to next step. If voltage is more than 1.5 volts, disconnect TP sensor connector. Inspect terminals. Repair as required. Perform TEST VER-1. If terminals are okay, replace TP sensor. Perform TEST VER-1.
  3. If vehicle is not equipped with a factory Vehicle Theft Security System (VTSS), go to next step. If vehicle is equipped with a factory VTSS, using scan tool, read VTSS status. If scan tool displays FUEL ON, go to next step. If scan tool does not display FUEL ON, see TESTS W/CODES - BODY CONTROL COMPUTER article in ENGINE PERFORMANCE section.
  4. Using scan tool, actuate fuel system. Listen for fuel pump operation at fuel tank. If fuel pump operation cannot be heard, go to TEST NS-5A. If fuel pump operation can be heard, turn ignition off.
  5. Ensure fuel tank is at least 1/4 full. Release fuel pressure. Install a fuel pressure gauge in fuel supply line. Turn ignition on. Using scan tool, actuate fuel system. Observe fuel pressure gauge. See FUEL PRESSURE SPECIFICATIONS table.
    FUEL PRESSURE SPECIFICATIONS

    Application psi (kg/cm2 )
    Dakota 11.5-17.5 (.8-1.2)
  6. If fuel pressure is more than specification, go to TEST NS-4B. If fuel pressure is less than specification, go to TEST NS-4A. If fuel pressure is within specification, go to next step.
  7. Check fuel injector area for fuel flow. If fuel is flowing, go to TEST NS-4C. If fuel is not flowing, go to next step.
  8. If vehicle starts and stalls repeatedly, go to TEST NS-7A. If vehicle does not start and stall repeatedly, go to TEST NS-3A.
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