T-45C TS, ADV & IUT ENG-07
Aircraft Fuel System
B.
Fuel delivery
Overlay 5
Boost Pumps
1.
Boost pumps
a.
Location
(1) Two boost pumps are mounted on a
manifold and installed in the negative-G
compartment of the wing tank
b.
Physical description
(1) Upper and lower body with interposing main
bearing assembly bolted together (houses
and supports motor)
(2) Filter-protected inlet at each end
(3) Electrically controlled and operated
c.
Functional description
(1) Provides fuel under pressure to LP pump
during all aircraft maneuvers
(2) Required during engine start because
engine-driven fuel pumps only marginally
capable of providing suction while at low
speed
(3) A time delay will take the electric fuel boost
pumps off line 30 seconds after loss of
aircraft generator
(4) Receives electrical power from the 28 VDC
essential services bus through 30-sec delay
(5) Fuel system feeds the engine LP pump for
initial fuel supply
Original (9-98)
Page 7-7
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