Fitment: Fits 1989-1996 F150 Truck E150 E250 E350, 1988-1997 F250 Truck F350 Truck . Replaces part number: 911-000, F1UZ-9B263-B, F1UZ9B263B, F1UZ 9B263B. Advantages: Easy to install and operate, can be directly installed into your machine without further adjustment. Function: The fuel tank selector valve adjusts and allows fuel to move from the front and rear fuel tanks through a selector switch. When the valve is opened, it opens one fuel tank and closes another, and vice versa. Package included: 1 * Fuel Tank Reservoir Selector Valve Assembly. This product does not contain instructions.