Chainsaw Repair

OK MY Bad, my saw is a older 55 rancher not the 455 , was having a senior moment I guess
 so that could explain the  wrong fuel PDF

LOL that explains why.   I was showing IPL's for the 455 you ask about originally. Least you figured it out that you had a 55. 

There are two parts to the vent.

First, there is the black tube that extends to the opposite side of the gas tank to prevent spills.

Then second, there is a little filter disk that fits in the outlet of the vent. This disk is easy to get out with a scribe or ice pick.

There should not be any reason to need to remove the tube? They are hard to get out because there is almost no way to get a hold on it.

Some later model chainsaws did not have the filter disk but had a plastic elbow with a tubing nipple on its end. The tubing went up inside the carb air box area into a loop and then connected to a nipple in the bottom of the carb air box that exited to the outside.

mine is an older one(made in 2002 I believe ) then it would be in the air box instead??

Husqvarna 51 55  IPL   http://s30387.gridserver.com/partsDiagrams/Husqvarna%2051%20and%2055.pdf

Looks like it is on the rear right side of tank area.

yea thats why I was wondering if you have to remove the tank to get at it or not?

 and whats the best way to change it then??

OK magnus
 the saws runs pretty good right now, maybe a tad high on idle, but its winter here now, so colder air always sems to do that here on a summer setting once wamed up

 but this saw did this before, leaking from tank when put down for the day or even a few minutes
 and last time I believe the dealer changed this filter and it solved the problem, thus why I am leaning to it being the issue

 I don't see how the carb would cause enough pressure for gas to be pushing out on the cap/ past o ring
 the filter being blocked or faulty doesn't really either to be honest  but can see how it not breathing can build up extra pressure I guess

 so what carb issue do you think would cause the gas to blow out then??