TM 9-6115-624-BD
d. Procedural Steps.
(1) Locate a temporary fuel container.
(2) Obtain a fuel line.
(3) Connect fuel line to container.
(4) Secure temporary fuel container to the outside of the generator in a position to allow gravity feed for the fuel.
(5) Connect fuel line to the inlet side of the mechanical or electrical generator fuel pump.
(6) Bleed the air from the fuel line.
Record the BDAR action taken. When the mission is completed, as soon as practicable, repair the generator using
standard maintenance procedures.
Section III. FUEL PUMPS
5-9.
General. It would be a tremendous duplication of effort to give procedures for changing fuel pumps in all
generator configurations. These procedures are adequately described in the respective maintenance technical manuals.
What is not given in these technical manuals is a list of alternate sources of supply for each respective fuel pump in case
a spare is unavailable. See Appendix A for a list of alternate sources of supply.
5-10. Fuel Pump, Interchangeability . Electric fuel pumps on generators can be interchanged with other generators
and sometimes combat vehicles. The difference in the pumps is normally the brackets used to locate the electrical unit.
The electrical fuel pump can be dismounted from the brackets and installed in the bracket for the generator being
repaired. The electrical fuel pump 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. The
generator/vehicle heater fuel pumps can be used to provide fuel to the engine.
5-11. Fuel Pump, Mechanical Failure . Electric fuel pumps will not 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 fuel pump. Mechanical pumps are substitutable with adequate operational
capabilities within the same engine family.
Section IV. FUEL LINES AND VALVES
5-12. General. Fuel lines route the fuel from the storage tanks to the filters and the engine fuel system. Lines are a
combination of 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.
5-13. 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 enough to fit: Torn or cut O-rings can be replaced using a larger O-ring and
cutting it to length. If an adhesive is available, glue the cut ends together. O-rings with small cuts can be coated with a
silicone gasket sealer to seal the leakage caused by the cut. Leaking fittings should first be tightened to attempt an easy
repair.
5-12. Fittings, Leaking . Flared fuel fittings will start to leak because of engine vibrations or overtightening. Leaking
fittings should first be tightened to attempt to stop the leak. If tightening does
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