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TM 55-2915-335-30&P
SECTION Ill. TECHNICAL
1-11. Fuel Flow.
PRINCIPLES OF OPERATION
a. The boost pump mounts through the bottom of a fuel tank. When installed, the inlet shutoff valve is locked in
the open position. Fuel flows into the open inlet valve to the pumping chamber.
b. When the boost pump is turned ON, the impeller pushes fuel from the inlet chamber to the outlet port. Impel-
ler pumping action causes high fuel pressure at the fuel outlet port.
c. The fuel boost pump uses a floating impeller. The impeller is free to move up and down on the motor shaft.
The force of fuel being pushed through the impeller causes a downward force on the impeller. The downward force
causes the impeller to press against the pump inlet seal. This forms a pressure seal that separates the inlet chamber
from the outlet chamber.
1-4
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