Why gas in air filter

get it adjusted and repaired under warranty
don't put up with it as it will get worse not better then be out of warranty

Interesting! Try seeing if it will run without the fuel tank cap on. There is normally a small hole to let air in as fuel is used, if this gets blocked the fuel will stop running from the tank. You probably won't be able to clean it well enough so a replacement cap shouldn't be too expensive.

Check to see if there is a leak in the air purge bulb (primer bulb), sometimes they crack and allow air in and don't push the gas through properly. Here is the manual for your saw.
Cheers!
http://www.manualslib.com/manual/514275/Husqvarna-455e-Rancher.html#manual

Gas filter might not run properly and it must be replace. If it gets bad enough the lawn mower might not turn on and in worse case gasoline could start coming out the air pusher.

this new gas is a carb killer you will need a new diaphragm for the carb and there is a little screan next to the needle and seat that can be cleaned. about a 5.00 repair if done right.. use marine gas

check your fuel filter/gas line in tank you could have a crack in your line that in the fuel till it gets below half tank then sucks air through crack, It's a possibility, other than that, check your exhaust port, but sounds like a fuel problem check your fuel tank vent also to make sure it is venting. Good Luck

The carburetor probably needs cleaning -- the float is sticking.

Charlie

You likely need to replace the muffler,this is a common problem and if the engine can't get rid of the exhaust it also will not take in more fuel,happens a lot with anything with a spark arrester in the muffler.

make sure the small vent hole on top of the gas cap is not clogged. Mine did the same thing and then I found mine was packed with dirt.

Have you tried cleaning the air filter? The carburetor fuel inlet may have screens plugged with sawdust as well. If you have spark and fuel and AIR you should get fire(combustion)

Frank