Diagnostic Routine(s)

Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. For information about these practices, REFER to: Diagnostic Methods .

The fuel tank filler pipe assembly is used to refuel the vehicle. The fuel tank inlet check valve prevents spitback of fuel during and after refueling. The fuel tank stores the fuel. The fuel tank contains a Fuel Pump and Sender Unit. The Fuel Pump and Sender Unit consists of a fuel level sender and a Fuel Pump. The fuel level sender sends a signal to the fuel gauge informing the driver of how much fuel is in the fuel tank. The Fuel Pump provides fuel to the fuel tubes, which supply the fuel rail.

During refueling, the fuel tank vents to the atmosphere through the vent and filler pipes, on vehicles without ORVR systems. In vehicles equipped with ORVR, the fuel tank and filler pipe are designed so that when the vehicle is being refueled, fuel vapors in the fuel tank travel to the EVAP canister, which absorbs the fuel vapors and vents the pressure from the fuel tank during refueling.

Under normal operation, fuel should flow at a steady rate through the fuel tank filler pipe into the fuel tank. As fuel enters the fuel tank air is vented through the filler pipe or the ORVR system.