2003 Polaris ATV Trail Boss 330 Factory Service Manual, Page 95Get this manual
FUEL SYSTEMCARBURETION
FUEL TANK ASSEMBLY
Vent line routed smoothly into center of steering post Forward
Tank to fuel valve connection -Gold fitting (tall stand pipe) to "ON"
Gas Tank Mounting Hardware
90 Degree Fuel Reserve Outlet Fitting (Marked "2" on fuel valve)
90 Degree Fuel Outlet Fitting (Marked 1) on fuel valve)