For higher fuel volume requirements of engines above about 150 horsepower, the high-performance Facet Cylindrical pumps can deliver. Pumps can also be combined in series or parallel to achieve any required pressure or flow. Facet 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 36 gallons per hour. Maximum pressure 4 to 5.5 psi. Typical flow 23 gallons per hour at 2 psi. 1/4 NPT female ports. Negative ground (12v) only. This pump features an internal 74 micron filter. This pump does not have an anti-siphon valve, so fuel can flow through when the pump is turned off. The Facet "Interruptor" style pumps now feature reliable solid-state technology instead of points!