This pump is designed for gas or smoke fluid(like kerosene) use. This pump works off the oscillations generated by the engine. Each time the engine fires, the pump reacts with a short rotation in the direction opposite of the propeller rotation. This will only work with the pump mounted in line with the arc of the prop and about 1.5" from the crankshaft centerline. It can also be used on side-mounted or inverted engines. It comes with the mounting plate, mounting screws, and complete instructions with warranty. WAJ 12/22/92 * These pumps are recommended for 4-stroke and giant scale 2-stroke engines (ones that produce lots of vibration) when one desires a pump. updated NMH 3-19-93