Principles of Operation

Fuel System

Principles of Operation

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

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 (FP) module. The FP (Fuel Pump) module consists of a fuel level sensor and a FP (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 FP (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 (On-Board Refueling Vapor Recovery) , 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 Emission (EVAP) canister, which absorbs the fuel vapors and vents the pressure from the fuel tank during refueling.