Section III. FUEL PUMPS

TM 5-3835-222-BD

c. Connect fuel line to container.

d. Secure temporary fuel container to the outside of the equipment in a position to allow gravity

feed for the fuel.

e. Connect fuel line to the inlet side of the mechanical or electrical equipment fuel pump.

f. Bleed the air from the fuel line.

Record the BDAR action taken. When the mission is completed, as soon as practicable, repair the

equipment using standard maintenance procedures.

Section III.

FUEL PUMPS

5-8. General. It would be a tremendous duplication of effort to give procedures for changing fuel

pumps in all equipment configurations. These procedures are adequately described in the respective

unit TM. What is not given in these TM's is a list of alternate sources of supply for each respective

fuel pump in case a spare is unavailable. See Appendix D for a list of alternate sources of supply.

5-9. Fuel Pump, In-Line Interchangeability. In-line fuel pumps on POL equipment can be inter-

changed with other POL equipment and sometimes generators. The difference in the pumps is

normally the brackets are used to locate the electrical unit. The electrical unit can be dismounted from

the brackets and installed in the bracket for the equipment being repaired. The electrical unit can

be clamped using the existing clamps or using an adjustable clamp from an air cleaner ducting system.

Use a strip of rubber or a rubber hose to aid in holding the pump in position.

5-10. Fuel Pump Failure. Electric fuel pumps will not normally supply the fuel pressure required

by the injector system if the mechanical fuel pump fails. However, limited operation in a degraded

mode is possible by replacing the mechanical pump with an electrical unit. Mechanical pumps are

substitutable with adequate operational capabilities within the same engine family. Some heater

fuel pumps can be used to provide fuel to the engine.

NOTE

If fuel is not reaching the engine, and the electric fuel pump is making

an audible clicking sound, the problem may simply be a poor ground.

Connect a piece of wire from the ground post of the battery to the frame

of the equipment. This may correct the problem.

Section IV.

FUEL LINES AND VALVES

5-11. General. Fuel lines route the fuel from the storage tanks to the filters and the engine fuel system.

Lines are a combination of rubber hoses and metal tubes. Leaks and fuel line blockages are common

failures. Clogged lines can be cleared by blowing compressed air through them. Broken or cracked

lines must be repaired or bypassed.

5-12. Seals, Fuel System, Leak. O-rings are used in some systems to seal the fuel in the lines.

BDAR, as well as normal repairs, will damage the O-rings. Fuel absorption will cause the O-rings to swell

causing reinstallation problems since they no longer fit into the O-ring groove. Some repairs are

possible if the O-ring is damaged. Swelled O-rings can be allowed to dry until they shrink in size

5-7