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TM 10-4930-250-13&P
2.7 DEFUELING PROCEDURE. (Refer to figure 2-25.)
•
System components are subject to damage from thermal expansion. To prevent damage to equipment, ensure all
components are completely defueled prior to transportation or storage.
•
Do not attempt defueling of more than one inlet hose at a time. Fuel spillage could occur and pose a hazard to
personnel and the environment.
a.
With the fuel transfer pump (1) runmng:
(1) Close all fuel drum (2) outlet elbow valve couplings (3).
(2)Close all unisex couplings (4) at fuel drum end of suction hoses (5).
(3)Beginning at fuel drums (2), disconnect suction hoses (5) one at a time, open unisex coupling (4), hold hose end
higher than intake manifold and close unisex coupling (6) at far end (intake manifold) of suction leg. Close
unisex coupling (4) at free end of leg and install dust cap.
(4)Repeat step (3) for each of the three remaining suction legs.
(5)Close emergency shutoff valve (7) as soon as fuel transfer pump (1) unloads.
b.
At the accessory module control panel (8), position ENGINE SWITCH to STOP position.
Do not run the fuel transfer pump dry. Running dry for more than 15 minutes will cause damage to the pump.
Never subject nozzles to auxiliary pump suction. Seals will rupture.
Drain nozzle immediately after disconnecting it from system. Trapped fuel can cause large internal pressure that
can damage the nozzle when the temperature rises.
NOTE
If nozzle recirculation wye (9) was in use, disconnect and drain wye. Connect discharge hose (10)
to recirculation manifold full flow leg (11).
c.
Close discharge unisex coupling valves (12), and disconnect and drain all nozzles (13).
d.
Defuel liquid fuel filter-separator (14).
(1) Close unisex coupling (15) on liquid fuel filter-separator (14) outlet valve.
(2) Disconnect discharge hose (10) from recirculation manifold (16).
(3) Disconnect one of the suction hoses (5) from fuel transfer pump (1) inlet for use in next step.
(4) Connect suction hose (17) removed from fuel transfer pump (1) inlet to the defueling unisex coupling (18) and
the unisex coupling (19) on the flow side of the auxiliary pump (20). Open unisex coupling valves.
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