TM 5-3810-300-24&P-3
Fuel Pump 2.2
certain that the parts rotate freely. If the shaft does not rotate
freely, attempt to free it by tapping a corner of the pump.
10. Install 1/8 " pipe plugs in the upper' unused drain holes.
11. If the pump is not to be installed immediately, place plastic
shipping plugs in the inlet and outlet openings to prevent dirt
or other foreign material from entering the pump.
Install Fuel Pump
The left-hand pump is used on "A" and "B" engines and the
right-hand pump is used on "C" and "D" engines. The pumps
are not interchangeable and cannot be rebuilt to operate in an
opposite direction. The pump must always be installed with
the inlet opening in the pump cover (marked "LH IN" or "RH
IN") on the side toward the cylinder block. Note in Fig. 2 that
the fuel pump is bolted to the blower. The pump is driven by a
drive disc at the rear of the blower lower rotor. Install the
pump as follows:
1. Affix a new gasket to the pump body mounting flange.
Then place the drive coupling fork on the square end of the
drive shaft.
Fig. 9 Installing Fuel Pump Drive Shaft and Gear Assembly
2. Place the fuel pump against the blower, being certain that
place the cover against the pump body with the two dowel pins
the drive coupling fork registers with the slots in the drive disc
in the cover entering the holes in the pump body. The cover
on the blower rotor shaft.
can be installed in only one position over the two shafts.
3. Secure the pump to the blower with three nylon patch bolts.
CAUTION: The coating of sealant must be
extremely thin since the pump clearances
NOTE: To provide improved sealing against
have been set up on the basis of metal-to-
leakage, nylon patch bolts are used in place
metal contact. Too much sealant could
of the former bolt and seal assemblies.
increase the clearances and affect the
efficiency of the pump.
Use care that
4. If removed, install the fuel inlet and outlet fittings in the
sealant is not squeezed into the gear
pump cover.
compartment, otherwise damage to the
gears and shafts may result.
5. Connect the inlet and outlet fuel lines to the fuel pump.
8. Secure the cover in place with eight bolts and lock
6. If the fuel pump is replaced or rebuilt, prime the fuel system
washers, tightening the bolts alternately and evenly.
before starting the engine. This will prevent the possibility of
pump seizure upon initial starting.
9. After assembly, rotate the pump shaft by hand to make
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