Fuel Tank: Description and Operation

Fuel Tank
The fuel tank is of a plastic construction and is retained to the vehicle by two steel support straps. The fuel tank support straps are mounted onto the underside of the vehicle chassis towards the rear of the fuel tank and retained by bolts to the vehicle towards the front of the fuel tank. Fuel tank ventilation is achieved through two fuel tank roll-over valves into an evaporative emission canister which absorbs fuel tank vapor. The fuel tank roll-over valves are integral to the fuel tank and will prevent fuel loss from the fuel tank if the vehicle becomes inverted. A fuel level valve is also incorporated into the fuel tank to prevent fuel overfilling, this allows the fuel tank to maintain adequate space for expansion of the fuel. Federal market vehicles only are fitted with leak check diagnostics which detect leaks in the fuel vapor system using signals from a vapor pressure sensor mounted in the evaporative emission canister purge vapor line.