FB7 - Fuel Pump Valve Leak-down

WARNING: Fuel in the fuel system remains under high pressure even when the engine is not running. To avoid injury or fire, release the fuel pressure from the fuel system before disconnecting any fuel line.

To release fuel pressure, refer to the Fuel Pressure Release Procedure. Service and Repair

Fuel Pressure Test Setup:

^ Connect the Rotunda Fuel Pressure Tester 014-00748, or equivalent, with EFI Test Adapter DA7C-9974-A between the fuel filter and fuel rail, with both the main and drain valves closed.

Data Link Connector:

^ Jump the fuel pump test terminal to ground.

^ Key "ON".

^ Run the fuel pump for 30 seconds minimum.

^ Remove the jumper and note fuel pressure on the gauge for 3 minutes.

^ Does the output fuel pressure decrease more than 13.78 kPa (2 psi) in 3 minutes?

YES -- Replace the fuel pump. Rerun the Fuel Pressure Test.

NO -- Go to Fuel Pressure Test.