1999 Polaris PWC Genesis, Ficht, X-45 Service Manual, Page 111Get this manual
FUEL SYSTEMCARBURETION Fuel Pump Operation Fuel Pump Operation
The pump supplies fuel to carburetorsOn three cylinder models two fuel pumps supply fuel to each of the end carburetors and commonly 10 the cenler cylinder
When the piston is on the upstroke crankcase pressure is low, the
diaphragm in the fuel chamber moves
Ill1 Piston on upstroke Inlet check valve open Oullet check valve closed
outward toward the chamber coverThis causes negative (Iow) pressure in
the fuel chamberThe check valve on the fuel supply side of the chamber opens, allowing fuel to enterThis vacuum causes the ouU check valve 10 et close so fuel cannot return from the