FUEL SYSTEM 337
Description
Low-pressure Fuel System
Figure 520 Low-pressure fuel system
1. Cylinder head
2. Fuel injector assembly (6)
3. Low-pressure fuel rail (cast in
intake manifold)
4. Transfer pump outlet tube
assembly
5. Low-pressure fuel supply pump
6. Primer pump assembly
7. Water drain valve
8. Drain valve (strainer)
9. Transfer pump inlet tube
assembly
10. Fuel filter cover
11. Fuel filter assembly
12. Fuel piping from tank(s)
13. Fitting (service port)
14. Fuel inlet ports (4)
The low-pressure fuel system draws fuel from the
fuel tank with a low-pressure fuel pump. Fuel fi rst
enters the fuel filter header, is heated by the optional
fuel heater (if necessary) and passes through the fuel
strainer. Fuel then passes through the low-pressure
fuel pump, tubing, and through the fuel filter. Fuel
finally passes through the intake manifold and cylinder
head and is delivered to each fuel injector.
EGES-265-2
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
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