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Home >> Isuzu >> 1996 >> Rodeo LS, 2.6 E >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing - 3.2L V6 >> Fuel System >> Fuel Pump Pressure Test

Fuel Pump Pressure Test

NOTE: Begin basic fuel system diagnosis with testing fuel pressure.
  1. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE. Attach Fuel Pressure Gauge Set (J-34730-1) and Adapter (J-35957-1) to Schrader fitting on fuel rail. 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 ). See FUEL PUMP PERFORMANCE table. 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 ENGINE CRANKS BUT WILL NOT RUN under TROUBLE SHOOTING. With engine idling, fuel pressure should be 25-30 psi (1.8-2.1 kg/cm2 ).
FUEL PUMP PERFORMANCE

Engine Application Unregulated Pressure psi (kg/cm2 ) Regulated Pressure psi (kg/cm2 )
3.2L (1) 41-46 (2.8-3.2) (2) 25-30 (1.8-2.1)
(1) With ignition on and vacuum hose disconnected from pressure regulator.
(2) With engine at idle or with 12-14 in. Hg vacuum manually applied to pressure regulator.
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