FB4 - Fuel Pressure Regulator Leak Down Check

^ Reconnect the vacuum hose.

^ With the Rotunda Fuel Pressure Tester 014-00748 or equivalent still installed from previous test, run the engine for a minimum of 30 seconds.

^ Stop the engine and observe the fuel pressure after 5 minutes.

^ Is the fuel pressure greater than 147 kPa (21 psi) after 5 minutes?

YES -- Go to FB5. FB5 - Fuel Pressure Regulator Valve Seat Leakage

NO -- Repeat this test step. If the fuel pressure still drops more than specified, to test the injector for leakage. Refer to pinpoint test FD4 FD4 - Fuel Injector Cleaning and Leakage Check

^ If injectors are OK, replace the fuel pressure regulator. Rerun Fuel Pressure Test.