Principles of Operation

PRINCIPLES OF OPERATION

NOTE: The following procedure diagnoses a slow to fill concern only. For all other concerns refer to Computers and Control Systems.

The fuel tank filler pipe assembly is used to refuel the vehicle. The fuel tank filler pipe inlet check valve prevents fuel leakage if a rollover of the vehicle should take place. The fuel tank stores the fuel. The fuel tank contains a fuel pump module. The fuel pump module consists of a fuel level sensor and a fuel pump. The fuel level sensor 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 on-board refueling vapor recovery (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 evaporative emissions (EVAP) canister, which absorbs the fuel vapors and vents the pressure from the fuel tank during refueling.