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Home >> Isuzu >> 1997 >> Rodeo LS, 2.6 E >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls - Basic Testing - 3.2L) >> Fuel System >> Fuel Pump Pressure Test
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Fuel Pump Pressure Test

WARNING: This page is about a different variant/trim than selected.
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  . 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

Model Application Unregulated Pressure psi (kg/cm2 ) Regulated Pressure psi (kg/cm2 )
Rodeo/Passport 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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