PRINCIPLES GASOLINE/DIESEL FUEL SYSTEMS - OD1620 - LESSON 2/TASK 2
(a) To meter the fuel accurately.
(b) To distribute the fuel equally to all of the cylinders at a
high enough pressure to ensure atomization.
(c) To control the start, rate, and duration of the injection.
b. Multiple Unit Injection.
(1) General System Operation (figure 43). The basic system consists
of a fuel supply pump, fuel filter, multiple unit injection pump, and one
injector for each cylinder. The operation of the system is as follows:
FIGURE 43. GENERAL SYSTEM OPERATION.