4F-8 Developed for Training Purposes Leerjet 35/36
October 2001
CAE SimuFlite
The fuselage XFER/FILLswitch is used to manage the fuselage
fuel. The FILL position opens the transfer valve (and fuselage
valve on aircraft with the gravity flow line installed), opens the
crossflow valve, and turns on the standby pumps. When the
fuselage tank is full, the standby pumps are turned off, the
transfer (and fuselage) and crossflow valves close, and the
fuselage full (green) light illuminates.
When the XFER/FILL switch is placed in the XFER position, the
transfer and crossflow valves open and the fuselage transfer
pump turns on to transfer fuel to both wing tanks. If the wing
tanks are full, fuel overflows through the vent tubes into the tip
tanks. When the fuselage tank is empty, a pressure switch
turns on the white EMPTY light to remind the crew to turn off
the XFER/FILL switch.
Operation
Placing the START-GEN switch to START energizes the
standby pump. This action moves fuel from the respective wing
tank through the fuel filter and firewall shutoff valve to the
enginedriven pump (refer to Powerplant chapter). When the
enginedriven fuel pump output pressure is sufficient, the
motive-flow valve opens and allows motive flow fuel to flow to
the jet pumps. The fuel computer turns off the standby pump at
45% N
2 and the jet pump then provides fuel pressure for the
engine-driven fuel pump. If the fuel pressure to the associated
engine drops below 0.25 PSIG, a red FUEL PRESS annuncia-
tor illuminate.
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