TM 10-4320-310-14
5-6. REPAIR FUEL LIFT PUMP (Continued)
REPAIR:
Dry cleaning solvent P-D-680 (safety or Stoddard's Solvent) is potentially
dangerous. Avoid repeated and prolonged breathing of vapors and skin
contact with the liquid. Do not use near open flame, arcing equipment, or
other Ignition sources. Always wear eye protection and protective clothing.
The flash point of P-D-680 Is 100°F to 138°F (38°C to 59°C).
Death or serious injury could occur if compressed air is directed against the
skin. Do not use compressed air for cleaning or drying unless the pressure
Is/has been reduced to 30 psi (2.06 bar) or less. When working with
compressed air always use chip guards, eye protection, and other personal
equipment.
1
Clean all parts except gasket (4) with dry cleaning solvent and dry with low-pressure compressed air.
2
Inspect mating surface of cover (3) and pump body (9) parts for roughness or other damage. Scratches or other
damage may result in pressure leaks.
3
Check for wear at contact areas. Replace pump body (9) or cover (3) if worn.
4
Inspect all parts for score marks and burrs. Parts must fit together tightly.
5
If parts are not repairable, replace.
ASSEMBLY:
Do not scratch or mar mating surfaces of pump body or cover. The fuel lift
pump may leak or otherwise malfunction after reassembly.
1
Install new diaphragm (8) into pump body (9).
2
Install upper pump chamber (7) on diaphragm (8).
3
Install six screws (6) finger tight. Move fuel primer lever (10) on pump body (9) to compress diaphragm spring.
Tighten the six screws.
4
Install fuel screen (5).
5
Lubricate gasket (4) with lubricating oil and install.
6
Install screw (1), gasket (2), and cover (3).
5-9
