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Home >> Isuzu >> 1994 >> Trooper LS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Fuel System >> Fuel Pressure & Fuel Pump Relay Test >> Fuel Pressure
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Fuel Pressure

  1. Relieve fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE. Attach Fuel Pressure Gauge Set (J-34730-1 ) and Adapter (J-35957-1 ) to outlet side of fuel filter. Disconnect pressure regulator vacuum hose. Turn ignition on. Allow fuel pump to run for about 2 seconds.
  2. Fuel system pressure should be about 41-46 psi (2.8-3.2 kg/cm2 ). Start engine and check for leaks. Connect pressure regulator vacuum hose. If engine will not start, fuel pump relay can be by-passed. Also see appropriate CHART A-3, ENGINE CRANKS BUT WILL NOT RUN under TROUBLE SHOOTING CHARTS. With engine idling, fuel pressure should be 25-30 psi (1.8-2.1 kg/cm2 ).
NOTE: To test fuel pump relay circuit, proceed to appropriate CHART A-5, FUEL PUMP RELAY CIRCUIT under TROUBLE SHOOTING CHARTS.
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