DIRECT SUPPORT MAINTENANCE
ADVANCED AVIATION FORWARD AREA REFUELING SYSTEM MODEL M100A1
REPLACE FUEL TRANSFER PUMP PN 8424 INLET O-RING
Compound, Anti-Seize, Molybdenum Disulfide
Wrench, Combination, 7/16 in.
Dry Cleaning Solvent
Key, Socket Head Screw, 5/16 in.
Fuel transfer pump defueled
Mark inlet and pump housing to establish assembly orientation.
Remove inlet (1) from pump housing (2).
Remove the six socket head screws (3), lock washers (4) and flat washers (5) that secure the inlet (1) to the pump.
Discard lock washers (4).
Install three, 1/4-28 x 1-1/2 inch jack bolts in the threaded holes spaced around the inlet circumference. Remove
inlet (1) from pump housing (2) by alternately tightening the jack bolts until inlet is free. Remove jack bolts from
Remove O-ring (6) from inlet (1) and discard O-ring (6).
Inspect impeller (7) and housing interior for damage. Minor scratches and dents will not affect operation. If severe
damage is noted, report to supervisor.
Inspect and clean O-ring groove as required. Any debris or foreign material may prevent the O-ring from seating
Degreasing solvent MIL-PRF-680, Type III, used to clean parts, is potentially dangerous to
personnel and property. Eye protection is required. Avoid repeated and prolonged skin contact by
wearing rubber gloves or nonporous gloves when handling solvents or material wet with dry
cleaning solvent. Wash hands immediately after exposure with soap and water and use a lanolin
based skin cream to prevent skin drying. Do not use near open flame or excessive heat. Be sure there
is good ventilation or the solvent vapors will build up in the air and become a poisonous mixture
which can cause physical injury or even death.
Rubber gloves should be worn when handling fueling system components due to the toxic effects of
some fuel additives and the dry cleaning solvent.
Clean interior of pump housing (2) with dry cleaning solvent SD (MIL-PRF-680), if required.