SECTION VI. Engine Fuel System
The engine fuel system provides the pressurized fuel needed for proper operation of the
compression ignition engine. An engine mounted mechanical fuel pump provides fuel to
the fuel injectors which inject fuel into the cylinder in the proper quantities. The fuel
injectors are cam-operated by pushrods and a rocker arm arrangement to provide fuel
injection at the proper time.
Figure 3-4. Engine Fuel System
Fuel injector failure should be noticeable through a loss of power or excessive smoke.
Within the Detroit Diesel family of engines the injectors are physically interchangeable
although their operating characteristics differ for the engine configuration they are
designed for. Injectors should be exchanged, if possible, in full sets to keep engine
operation balanced between cylinders. Single replacement is, however, possible. The
defective injector can be located by following this procedure.