Figure 5-14. Unit Injection System.

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Figure 5-12. & Figure 5-13. Distributor-Type Unit Injectors.

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TM-9-8000 Principles of Automotive Vehicles Manual

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Figure 5-15. Unit Injector Operation

TM 9-8000

Figure 5-14. Unit Injection System.

filter, and directly to the Individual injector units. The

multiple unit Injection system (para 5-14).

The

fuel is supplied at low pressure, approximately 20 psi

difference Is that rather than using a centrally located

(137.9 kPa).

unit to house the high-pressure pumps, control racks,

pressure regulators, and delivery valves, they are all

c. Injector Units (Fig.

Unit Injectors

incorporated into each Injector.

This eliminates the

need for high pressure lines or any other apparatus

combine the Injection pump, the fuel valves, and the

besides the fuel supply pump.

nozzle In a single housing.

These units provide a

complete and Independent Injection system for each

b. Fuel Supply. Fuel Is drawn from the fuel

cylinder. The units are mounted

TA233450

tank by the fuel supply pump, through the primary fuel

5-19