2003 Polaris ATV Trail Boss 330 Factory Service Manual, Page 97Get this manual
FUEL SYSTEMCARBURETION
CV CARBURETOR SYSTEM FUNCTION
Carburetor Component Function
System Main Components Main Function Main Affect
VENT SYSTEMSCV CARBURETOR
The carburetor float bowl vent lines supply atmospheric pressure to the float bowlThe lines must be free of kinks, restrictions and be properly routedThis allows fuel to flow in the proper amount and prevents contaminants from entering the carburetor
Inlet Pipe, Needle and (Level Control) Seat, Float, Float Pin
Float System
Maintains specified fuel level in float chamber (carburetor float bowl)