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TM 9-2320-356-BD
Section IV.
FUEL LINES AND VALVES
6-10.
GENERAL
Fuel lines route the fuel from the storage tanks through the filters to the engine
and back to the tanks.
Lines are a combination of rubber hoses and metal tubes.
Leaks and blockages are common failures.
Clogged lines can be cleared by blowing
compressed air through them.
Broken or cracked lines must be repaired or
bypassed.
Various methods of repair are given in this section. Other line repairs
are also listed in chapter 3, sections IX and X.
6-11.
FUEL SYSTEM SEALS LEAK
General Information:
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 installation problems since they no longer fit into the O-ring
groove.
Some repairs are possible if the O-ring is damaged. Swollen O-rings can
be allowed to dry until they shrink enough to fit. Torn or cut O-rings can be
replaced with a larger O-ring by 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 stop the leakage caused by the cut, if the cut in the
O-ring is not against a moving surface. Refer to paragraph 3-27.
6-12.
FITTINGS LEAK
General Information:
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 not stop the leak, string can be used to push the flared
tubing more firmly against the mating surface.
Coating the string with a gasket
sealing compound will aid in stopping leaks in a low-pressure fuel line.
Limitations:
o None
Personnel/Time Required:
o 1 soldier
o 30-60 minutes
Materials/Tools:
o Fuel-resistant sealant
( s i l i c o n e , rubber, or similar
material)
o String or light tie cord
6-8
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