The Facet Gold-Flo model 40131 fuel pump was originally made for use in Onan generators, but it has also been used by several other manufacturers of generators and stationary industrial engines. Facet Cylindrical fuel pumps have low power requirements (about 1 amp at 12 volts) and operate without troublesome seals or diaphragms. Built-in pressure relief means no flooding after shutting down a hot engine. Facet pumps are compatible with gasoline, alcohol blends (up to and including E85), diesel, biodiesel, and fuel additives. Maximum fuel delivery 34 gallons per hour. Maximum pressure 4 to 5.5 psi. A typical application might flow 23 gallons per hour at 2 psi. 24 inch vertical dry lift. 1/8 NPT female ports. Negative ground (12v) only. This pump features an internal 74 micron filter. A built-in anti-siphon valve prevents the tank from draining when the pump is turned off. It does not have a one-way valve, so fuel can flow backwards when the pump is off. Facet pump number 40131(E)*. This pump can also replace Facet pump numbers 480545 and 480618. * Note: The Facet "Interruptor" style pumps now feature reliable solid-state technology instead of points! The "E" stands for "Electronic".