1999 Polaris SLH, SLTH, SLX, SLTX, PRO785 Factory Service Manual, Page 132Get this manual

1999 Polaris SLH, SLTH, SLX, SLTX, PRO785 Factory Service Manual, Page 132

FUEL SYSTEMCARBURETION Fuel Pump Operation Fuel Pump Operation, Keihin The fuel pump is mounted to the rear cylinder (PTO
causes the outlet check valve to close so fuel cannot return from the carburetorSee III1III1 Piston on upstroke Inlet check
Outlet check valve closed Negative (low) crankcase Fuel return to tank Cl Cl ::I: Cl Cl When the piston is on its downstroke,
the pressure from the crankcase becomes positive causing the diaphragm to move in the opposite direction, reversing the pressure
in the pump chamberThis causes the inlet check valve to close and the outlet valve to open, delivering pressurized fuel to