Fuel Pressure

Fuel Rail Pressure 1 - 1.8 MPa (1,450 psi)

Measured with scan tool by observing actual fuel rail pressure parameter.

NOTE: The engine will not run without an actual fuel rail pressure more then 10 MPa (1,450 psi).


Refer to "Engine Cranks But Does Not Run" for specific diagnosis. Engine Cranks But Does Not Run





FUEL INJECTOR RETURN FLOW AND FUEL PRESSURES









The fuel return from the fuel injectors to the tank will vary based on the API value of the fuel. Measure the Fuel API with the Diesel Fuel Quality Tester. For this reason the Fuel System Diagnosis - High Pressure Side values will vary for identifying a fuel injector or fuel pump concern. Use the following tables when referred to by the diagnostic. The first table is to be used during the initial diagnosis to identify the worst fuel injectors. After the fuel injectors that fail the first part of the test are capped off, the return flow from each uncapped fuel injector must be measured again. This is because the fuel system is returning less fuel to the tank, and thus the fuel pressure is higher during the retest. Failure to use the correct table may result in the replacement of good fuel injectors.