FC1 Check Fuel Pressure Regulator For Cause of High Pressure

^ Check leaks in the engine vacuum system due to loose or mis-threaded fittings, cracks, or blockage that could cause insufficient vacuum to properly control the fuel pressure regulator.

^ Check the fuel pressure regulator housing for damage or dents that could cause a higher spring load on the fuel pressure regulator.

^ Check the integrity of the fuel pressure regulator diaphragm in the procedure described in Test Step FB3. FB3 Check Fuel Pressure Regulator Condition

General Specifications:

^ Is the fuel system free of defects that could cause the fuel pressure regulator to produce excessive fuel system pressure? (Refer to the fuel pressure specification in the specifications chart in image).

YES -- REPLACE the fuel pressure regulator.
RERUN Test Step F1. F1 Perform Fuel Pressure Test

If the pressure is still high, GO to FC2. FC2 Check Fuel Return For Cause of High Fuel Pressure

NO -- REPAIR or REPLACE damaged components as required.
RERUN Test Step F1. F1 Perform Fuel Pressure Test

If the pressure is still high, GO to FC2. FC2 Check Fuel Return For Cause of High Fuel Pressure