2000 Polaris Virage TX, SLX, Pro 1200, Genesis, Genesis FFI Personal Watercraft Service Manual, Page 105Get this manual
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FUEL SYSTEMCARBURETION Fuel Tank Vent System
Operation
The fuel tank vent system consists of an inlet check valve and pressure relief valveThe inlet check valve allows air to enter the tank as the fuel supply is being usedThe pressure relief valve maintains 1-1.5 PSI positive pressure in the fuel tankIf pressure in the tank exceeds 1.5 PSI, the valve releases and excess pressure is allowed to escape
Inspection
The check valves can be tested for proper operation by applying pressure to one end with the Mity VacTMApply approximately PSI to the end of the valve marked VACThe valve should hold steady pressureTry to apply pressure to the other end of the valve, it should allow air to go through easily with no pressure build upReplace the check valve if found to be faulty