Chapter 4. FUEL SYSTEM MAINTENANCE

TM5-241O-237-34

CHAPTER 4

FUEL SYSTEM MAINTENANCE

DESCRIPTION AND DATA

Section 1.

4-1. GENERAL

Fuel system maintenance procedures not covered in this chapter can be found in TM5-

2410-237-20.

4-2. PRINCIPLES OF OPERATION

Fuel Flow. Fuel is pulled from fuel tank (1) through primary fuel filter (2)

and priming pump check valves (3) by fuel transfer pump (4). From the fuel

transfer pump the fuel is pushed through secondary fuel filter (5) and to the

fuel manifold in fuel injection pump housing (6). The pumping spring in the fuel

transfer pump keeps the fuel pressure in the system at 25 to 42 psi. Constant

bleed orifice (7) lets a constant flow of fuel go through fuel return line (8)

4-1