BENDIX Electric Fuel Pumps: Description
The Bendix electric fuel pump is composed of pump housing and both mechanical and electrical parts. The cylindrical housing has a permanently fixed dome-shaped top, and installed just below this top is a corrugated diaphragm. Located at the bottom of the pump is a detachable cover with a seal. The lower cover is equipped with a small magnet to remove any metallic particles carried in the fuel. Soldered into the housing are three fittings; fuel inlet (at bottom), fuel outlet (at top), and electrical terminal (center). Centrally located within the housing is a brass tube, soldered to the housing, in which the pump piston travels. The mechanical parts of pump are the valve carrier, pump piston and pump spring. Valve carrier is attached to the brass tube socket by three retaining screws and attached to its bottom is the actuating stud with its valve. The pump spring is located in upper portion of pump piston. The electrical part consists of coil, resistor, and magnetic circuit breaker. Initial terminal of coil is at housing electrical terminal and coil end is soldered to contact spring of circuit breaker. The resistor is a thin, cotton-spun wire, loosely wound around coil with a cotton strip and is wired across coil windings, providing a connection between housing terminal and ground. Magnetic circuit breaker is mounted on the circuit breaker base, located above coil, and consists of a permanent magnet and a circuit breaker. The permanent magnet is arranged as a trigger magnet in that it is soldered into the pivoting circuit breaker; the mating, fixed contact of the circuit breaker is attached to a contact spring, but is insulated. Attached to the fixed contact is the end terminal of the coil windings. A copper wire is soldered between the movable contact and the circuit breaker fixture.