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Home >> Isuzu >> 1992 >> Trooper LS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Fuel System >> Fuel Pressure & Fuel Pump Relay Test >> Fuel Pressure (3.1L Pickup & Rodeo)

Fuel Pressure (3.1L Pickup & Rodeo)

  1. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE under FUEL SYSTEM.
  2. Install fuel pressure gauge between steel line and flexible hose at throttle body. Start engine, check for leaks and allow engine to idle. Fuel pressure should be 9-13 psi (.62-.91 kg/cm2 ).
  3. If engine will not start, apply battery voltage to fuel pump test terminal connector (Black/Red wire). Test terminal connector is a single wire with a clear-colored connector, located in wiring harness on left fender, under fuse/relay box.
  4. If engine still will not start, see appropriate CHART A-3, ENGINE CRANKS BUT WILL NOT RUN under DIAGNOSTIC CHARTS.
    NOTE: Ensure Code 54 is not set by ECM before going to next step. See appropriate TESTS W/CODES article in the ENGINE PERFORMANCE Section.
  5. If Code 54 is not set and fuel pump does not read within specification, see appropriate CHART A-7, FUEL SYSTEM PRESSURE TEST under DIAGNOSTIC CHARTS.
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