Fuel Pump - Suzuki GSX1400 Service Manual

FUEL PUMP

The electric fuel pump is mounted at the bottom of the fuel tank, which consists of the armature, magnet,
impeller, brush, check valve and relief valve. The ECM controls its ON/OFF operation as controlled under the
FUEL PUMP CONTROL SYSTEM.
When electrical energy is supplied to the fuel pump, the motor in the pump runs and so does the impeller.
This causes a pressure difference to occur between both sides of the impeller as there are many grooves
around it. Then the fuel is drawn through the inlet port, and with its pressure increased, it is discharged
through the outlet port. The fuel pump has a check valve to keep some pressure in the fuel feed hose even
when the fuel pump is stopped. Also, the relief valve is equipped in the fuel pump, which releases pressurized
fuel to the fuel tank when the outlet of the fuel pressure has increased up to 450 – 600 kPa (4.5 – 6.0 kgf/cm
64 – 85 psi).
When the impeller is driven by the motor, pressure differential occurs between the front part and the rear part
of the blade groove as viewed in angular direction due to fluid friction. This process continuously takes place
causing fuel pressure to be built up. The pressurized fuel is then let out from the pump chamber and dis-
charged through the motor section and the check valve.
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Relief valve
Brush
Outlet port
Check valve
Blade groove
Outlet
Impeller
Magnet
Armature
Inlet
Flow clearance
Turning direction
Motor shaft
Vortex flow
FI SYSTEM 4-11
Impeller
Inlet port
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