TM 9-2330-398-10
2-18.
FUELING/DEFUELING PRECHECK AND OPERATIONS SUMMARY.
a.
LOADING PRECHECK
WARNING
When filling tank by means of bottom loading or self-loading, a test of the precheck system is
mandatory. If this system is not functioning, stop all operations. Determine the problem and have
it corrected by a qualified technician. Failure of automatic shut- off to function may result in
uncontrolled fuel spillage and danger of fire and explosion.
1.
Shortly after fuel flow has begun, open precheck valve D (4) to precheck automatic shut-off. Opening valve D (4)
sends fuel to float valve (2) inside tank to simulate full-tank condition.
2.
If shut-off float is functional, flow should stop after about 20-25 seconds.
3.
Close valve D (4). Flow will resume in about 20 seconds.
4.
During normal loading through bottom of tank (3), shut-off system will stop incoming flow automatically when fuel
reaches the level of the float valve (2).
b.
LOAD/UNLOAD SELECTOR
Before opening any valves for a fuel-servicing operation, make sure unload/load selector valve E (5) handle is in
proper position for fuel-servicing operation.
(a)
Load Position. When selector valve E (5) is in load position, it directs pilot pressure to the 4-inch (10.16- cm)
2-44