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Home >> Mitsubishi >> 1992 >> Eclipse Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 1.8L >> Self-Diagnostic Tests >> Test NS-2A - Checking Fuel System
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Test NS-2A - Checking Fuel System

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For appropriate wiring diagram, see WIRING DIAGRAMS .
  1. Turn ignition on. Remove fuel tank filler cap. Using DRB-II, actuate fuel pump. Listen for fuel pump operating sound at fuel tank filler pipe. If fuel pump is not operating, perform TEST NS-3A  . High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE at beginning of article.
  2. If fuel pump is operating, turn ignition off. Disconnect fuel pump connector at fuel tank. Crank engine for 10 seconds. Turn ignition off. Disconnect negative battery cable. Release fuel pressure. Connect fuel pressure gauge and adapter to fuel rail. Reconnect negative battery cable and fuel pump connector at fuel tank.
  3. Connect a jumper wire between battery positive terminal and single-wire fuel pump check connector Black/White wire, located near battery in engine compartment. Ensure no fuel leaks are present.
  4. Read fuel pressure gauge. If fuel pressure is not between 38-50 psi (2.7-3.5 kg/cm2 ), go to next step. If fuel pressure is between 38-50 psi (2.7-3.5 kg/cm2 ), disconnect jumper wire. Remove and inspect spark plugs. If spark plug tips are wet, clean and dry plugs. Install spark plugs, and perform TEST VER-1  . If spark plug tips are dry, check engine for a mechanical failure (i.e., valve timing and engine compression), repair as necessary, and perform TEST VER-1  .
  5. If fuel pressure is less than 50 psi (3.5 kg/cm2 ), go to next step. If fuel pressure is more than 50 psi (3.5 kg/cm2 ), inspect for restricted fuel return line. Repair as necessary and perform TEST VER-1  . If fuel return line is not restricted, replace fuel pressure regulator, and perform TEST VER-1  .
    CAUTION: DO NOT  allow fuel pressure to exceed 60 psi when squeezing fuel return hose.
  6. Squeeze fuel return hose. If fuel pressure is more than 38 psi (2.7 kg/cm2 ) when fuel return hose is squeezed, replace fuel pressure regulator, and perform TEST VER-1  . If fuel pressure is less than 38 psi (2.7 kg/cm2 ) when fuel return hose is squeezed, remove jumper wire from fuel pump check connector. Stop squeezing fuel return hose. Inspect fuel supply line for a restriction.
  7. If a restriction exists in fuel supply line, repair as necessary, and perform TEST VER-1  . If no restriction is present in fuel supply line, disconnect fuel pump electrical connector at fuel tank. Crank engine until fuel pressure gauge reads zero psi.
  8. Disconnect fuel filter. Inspect fuel filter for restriction. If fuel filter is restricted, replace fuel filter, and perform TEST VER-1  . If fuel filter is not restricted, replace fuel pump, and perform TEST VER-1  .
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