FB3 Check Fuel Pressure Regulator Condition

^ Observe Fuel Handling Instructions in Technician Safety Information section.

^ Release the fuel system pressure. Fuel System Pressure Relief

^ Install Rotunda Fuel Pressure Testing Kit 014-00748, or equivalent with EFI Test Adapter D87C-9974-A in the fuel line between the fuel filter and fuel rail with its main valve open and its drain valve closed,

^ Start the engine and run for 10 seconds.

^ Stop the engine and wait 10 seconds.

^ Start the engine again and run for 10 seconds.





^ Stop the engine and remove the vacuum hose from the pressure regulator.

^ Examine the vacuum port in the pressure regulator for evidence of fuel leakage through the diaphragm.

^ Connect Rotunda Vacuum Tester 021-00037 or equivalent, to the fuel pressure regulator and apply a 20 in-Hg vacuum.

^ Is the vacuum port OK, and does the fuel pressure decrease when vacuum is applied?

YES -- GO to FB4. FB4 Check Fuel Pump Flow Volume

NO -- REPLACE the fuel pressure regulator and RERUN Test F1. F1 Perform Fuel Pressure Test