Fuel Tank Vent System - Polaris Virage TX 2000 Service Manual

FUEL SYSTEM/CARBURETION
Fuel Tank Vent System
Operation
The fuel tank vent system consists of an inlet check valve and a pressure relief valve. The inlet check valve allows
air to enter the tank as the fuel supply is being used. The pressure relief valve maintains a 1-1.5 PSI positive
pressure in the fuel tank. If 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 Vac™. Apply
approximately 5 PSI to the end of the valve marked VAC. The valve should hold steady pressure. Try to apply
pressure to the other end of the valve, it should allow air to go through easily with no pressure build up. Replace
the check valve if found to be faulty.
Relief Valve Testing
Apply air pressure with a Mity Vac™ to relief valve.
With air pressure applied in the direction of the ar
row, the valve should "pop" between 1.0 and 1.5
PSI. In the opposite direction it should hold pres
sure.
Fuel Tank Check Valve Testing
To test the air inlet check valve, remove the valve
and apply approximately 5 PSI pressure to the end
of the valve marked "VAC". The valve should hold
steady pressure. Connect the tester to the other
end and apply pressure. Air should pass through
the valve with no pressure build up. Replace the
check valve if it holds pressure both ways or fails
to hold pressure one way.
Relief Valve
Apply 1 -1.5 PSI
3100
3.42
Polaris Sales Inc.