gear pump and the use of a restricted fitting
located at the cylinder head return fuel
4. To purge the fuel system of any air; the system is
recirculator-y in operation, therefore allowing
any air to be returned to the fuel tank.
Since the basic fuel system used on all Detroit
diesel engines is identical as far as components used, the
description of operation for one can be readily related to
any other series of Detroit diesel engine (fig. 5-23).
The basic fuel system consists mainly of the
1. Fuel injectors.
2. Fuel pipes to and from the injectors (inlet and
3. Fuel manifolds, which are cast internally within
the cylinder head. The upper manifold is the
"inlet" and the lower is the "return" or "outlet."
To prevent confusion, the words in and out are
cast in the side of the head.
Figure 5-23.Diagram of typical Detroit diesel fuel system.