Suzuki DL650K5 Service Manual page 218

5-4 FUEL SYSTEM AND THROTTLE BODY
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
discharged through the motor section and the check valve.
1 Outlet
2 Blade groove
3 Inlet
4 Flow clearance
5 Impeller
6 Motor shaft
7 Vortex flow
A Turning direction