Figure 3-10. Fuel pump assembly exploded view.
a. Refer to figure 3-10. Remove coupling fork (3) Remove cover screws (4) and bushing (5). Separate cover (6)
from the pump body, using care not to damage the finished faces of the pump body and cover.
b. Withdraw drive shat (8), drive gear (9) and gear retaining ball (7) from the unit as an assembly.
c. Press the drive shaft (8) just far enough to remove the steel locking ball (7). Then invert the shaft and gear
assembly and press the shaft from the gear.
Do not press the squared end of the shaft through the gear. The squared end will cause slight scoring of the
oil seal contact surface.
d. Remove shaft and gear (10) as an assembly from the pump body. Do not attempt to remove the gear from the
shaft. The driven gear and shaft are treated as an assembly.
e. Remove relief valve plug (11), and remove gasket (12), spring (13), valve pin (14) and relief valve (15)
from the pump body.
f Remove alignment pins (16). Remove oil seals (17) from the pump body (18).
3-52. Inspection and Repair
a. Clean all parts with cleaning solvent, Federal Specification P-D-680, or equivalent, before inspection.
b. Oil seals once removed from the pump body, must be replaced. Replace all gasket.
c. Check pump gear teeth for scoring, chipping, cracks or wear. Check the ball slot in the drive gear for wear.
Replace the gear if the slot is badly worn.
d. Inspect the drive and driven shafts for scoring or wear.
e. The mating surfaces of the pump body and pump body cover must be flat and smooth, and must fit tightly
together. Any scratches or slight damage may result in pressure leaks. Also check for wear at areas contacted by gears
and shafts. Replace the cover and/or body if necessary.
f. The relief valve must be free from score marks a nd burrs, and must fit its seat in the pump body. If the