TM 5-3810-300-24&P-3
Fuel Pump 2.2
The mating faces of the pump body and cover must be flat and
7. If the oil seals need replacing, remove them with oil seal
smooth and fit tightly together. Any scratches or slight
remover J 1508-13 (Fig. 5). Clamp the pump body in a bench
damage may result in pressure leaks. Also check for wear at
vise and tap the end of the tool with a hammer to remove the
areas contacted by the gears and shafts. Replace the pump
outer and inner seals.
cover or body if necessary.
NOTE: Observe the position of the oil seal
The relief valve must be free from score marks and burrs and
lips before removing the old seals to permit
fit its seat in the pump body. If the valve is scored and cannot
installation of the new seals in the same
be cleaned up with fine emery cloth or crocus cloth, it must be
position.
replaced.
Inspection
Current standard fuel pumps (with 1/4"wide gears) incorporate
a 1/8" shorter pump body with three drain holes, a 1/8" shorter
Clean all of the parts in clean fuel oil and dry them with
drive shaft and a cover with a 3/8"inlet opening. When
compressed air.
replacing a former pump, a 3/8"x 1/4" reducing bushing is
required for the inlet opening and the unused drain holes must
Oil seals, once removed from the pump body, must be
be plugged.
discarded and replaced with new seals.
Assemble Fuel Pump
Check the pump gear teeth for scoring, chipping or wear.
Check the ball slot in the drive gear for wear. If necessary,
Refer to Figs. 1, 3 and 6 and assemble the pump as follows:
replace the gear.
I. Lubricate the lips of the oil seals with a light coat of
Inspect the drive and driven shafts for scoring or wear.
Replace the shafts if necessary. The driven shaft is serviced
as a gear and shaft assembly only.
Fig. 6 - Fuel Pump Details and Relative Location of Parts
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