1999 Polaris SLH, SLTH, SLX, SLTX, PRO785 Factory Service Manual, Page 133Get this manual
FUEL SYSTEMCARBURETION Fuel Pump Maintenance Fuel Pump MaintenanceKeihin
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 Cleaning: The pump and impulse line must be disassembled and cleaned whenever water is present in fuel (beyond separator) or in the engine Impulse Diaphragm Inspection: Loosen clamp and remove impulse line from pump fitting Apply PSI pressure to impulse line fittingThe diaphragm should hold pressure indefinitelyRemove and inspect the pump diaphragms if the impulse chamber does not hold pressure