DISTRIBUTOR-TYPE FUEL SYSTEMS

The distributor-type fuel system is found on small-to medium-sized diesel engines. Its operation is similar to an ignition distributor found on gasoline engine. A rotating member, called a rotor, within the pump distributes fuel at high pressure to the individual injectors in engine firing-order sequence.

There are several manufacturers of distributor-type fuel injection systems. Operation of the fuel distribution is similar, in that a central rotating member forms the pumping and the distributing rotor is driven from the main drive shaft on which the governor is mounted.

The distributor-type fuel system that will be discussed is the DB2 Roosa Master diesel fuel-injection pump, manufactured by Stanadyne's Hartford Division.