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Page Title: Section VI. MAINTENANCE OF PUMP SUCTION AND DISCHARGE ASSEMBLIES
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severe dents. Make sure the cap and chain are
11.
Fuel tank strap
KEY to fig. 4-1:
1. Tube nut
12.
Fuel tank cap
present and are in good condition,
2. Copper tube
13.
Chain
c. Inspect the fuel strainer for a cracked bowl or
14.
Fuel tank
3. Adapter
body, damaged threads, and distorted bowl bail.
4. Elbow
15.
Cap screw
Make sure the bowl glass is clear so that the fuel is
5. Fuel strainer
16.
Flat washer
visible in the bowl. Check the fuel shutoff valve on
17.
Lower fuel tank bracket
6. Nipple
18.
Cap screw
7. Cap screw
the fuel strainer. Make sure it operates freely and
19.
Lock washer
8. Nut
effectively.
20.
Lifting bail
9. Leek washer
d. Inspect the fuel line for cracks, dents,
21.
Upper fuel tank bracket
10. Flat washer
damaged tube nuts, clogging, and other damage;
replace the fuel line.
4-11. Cleaning and Inspection
e. Inspect the fuel tank straps for cracks,
distortion, and other damage; replace damaged
a. Clean all parts with an approved cleaning
straps:
solvent. Flush the fuel line with solvent and blow it
f. Inspect all other parts for cracks, distortion,
out with clean, filtered compressed air.
and damaged threads; replace damaged parts.
Warning: The fuel tank is normally
replaced if damaged. However, if expediency
4-12. Reassembly
requires that the fuel tank be repaired by any
a. Reassemble the fuel system as shown in figure
method involving heat or flame, steam-clean
the tank thoroughly to assure that all traces of
b. After reassembly, fill the fuel tank with fuel,
gasoline are removed before starting repairs.
making sure the fuel shutoff valve on the fuel
Failure to purge the tank of all traces of fuel
strainer is open. Check the entire fuel system for
fumes before applying heat or flame may result
leaks. Correct any leaks before restoring the unit to
in a severe explosion.
service.
b. Inspect the fuel tank for cracks, leaks, and
Section VI. MAINTENANCE OF PUMP SUCTION AND
DISCHARGE ASSEMBLIES
relieve the vacuum caused by the diaphragm as it is
4-13. Description
pulled upward (A, fig. 4-2 ). It prevents reverse
a. The pump suction assembly is mounted on
movement of the water as the diaphragm is pushed
one side of the diaphragm pot to control the fluid
downward, since the check valve is pushed tightly
movement at the inlet side of the pump. It consists
against its seat, presenting the water from escaping
mainly of a check valve mounted in a housing. This
from the suction port (B, fig. 4-2).
check valve allows water to flow into the pump to

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