Committed to quality and innovation, Standard Motor Products is a global leader in engine management solutions. This 3-port Fuel Tank Selector Valve is designed for vehicles with one main and one auxiliary fuel tank, supporting both gasoline and diesel systems without return lines. Engineered for durability and backed by decades of R&D, this valve ensures reliable fuel switching when your original equipment fails. Standard's OE-level expertise ensures a precise fit and long-lasting performance. Installation Notes: Not compatible with fuel injection or diesel systems using in-tank fuel pumps. Valve must be located between the fuel tanks and the fuel pump. Not for marine applications. Maximum vacuum: 8 PSI. Operates in ambient temperatures from -40°F to +180°F. Install in a horizontal position on a chassis rail using lock washers for grounding. Use fuel filters on both tanks before the valve to prevent debris damage. Fuel Flow: De-energized: Main tank to fuel pump Energized: Auxiliary tank to fuel pump Electrical Notes: Includes dash-mounted toggle switch wiring instructions. Requires a 1-amp fused connection to accessory power. Proper grounding and corrosion prevention (grease at connections) are recommended.