I have a 2006 sportsman 800 EFI, the machine builds up an incredible amount of pressure in the gas tank, I assume the vent tube is blocked or kinked, has anybody else had this problem and do you know the fix for it. is the vent tuber easy to get too? After an hour or so of rididng I take the cap off and the pressure is so much it seems the tank should bust.

 

If the tube on an 800 is the same as my 700, them its located right under the tank plastic next to the filler neck. My 02 has a little elbow screwed into the tank and then a small clear plastic hose connected to it, maby an 1/8" in diameter. I think it runs down into the steering neck. My budys grizz 660 plugs up in the mud and will kill his carburated machine.

 

i would say that it must be pinched for sure. im surprised it still runs good w/ it that way.