2004 Polaris Freedom, Virage, Genesis and MSX-140 Service Manual., Page 154Get this manual
FUELEXHAUST SYSTEMS Fuel Pump Maintenance
The fuel pump does not require any specific scheduled maintenanceHowever, the following should be observed: Output: The pump output may be checked by removing the fuel supply line from the rear cylinder carburetor (PTO end) and placing it into containerWith the engine idling steady small stream of fuel should be observed
S Cleaning: The pump and impulse line must be disassembled and cleaned whenever water is present in fuel (beyond separator) or in the engine
S Impulse Diaphragm Inspection: Loosen clamp
and remove impulse line from pump fittingApply PSI pressure to impulse line fittingThe diaphragm should hold pressure indefinitely.2 Remove and inspect the pump diaphragms if the impulse chamber does not hold pressure