Subaru LEGACY 2002 Quick Reference Index page 70

Fuel Injection (Fuel System)
When the ignition switch is turned ON, fuel pump relay is activated. Then the motor operates to
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rotate the impeller.
! As the impeller rotates, fuel in a vane groove of the impeller flows along the fuel passage into
the next vane groove by centrifugal force. When fuel flows from one groove to the next, a pressure
difference occurs due to friction. This creates a pumping effect.
! The fuel pushed up by rotation of the impeller then passes through the clearance between the
armature and the magnet of the motor and is discharged through the check valve.
When the fuel discharge pressure reaches the specified level, the relief valve opens and excess
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fuel is released into the fuel tank. In this manner, the relief valve prevents an abnormal increase
in fuel pressure.
! When the engine and the fuel pump stop, spring force acts on the check valve to close the dis-
charge port, so that the fuel pressure in the fuel delivery line is retained.
FUEL LINE
FU-12