Husqvarna 142, Tank wont vent. I took cap off and blew in fuel line it blows fine so the duck breather is plugged. Does anyone know how much of the saw I need to take apart? or can it be acce easier?

That is a fuel tank vent kit. Most models have a vent in the fuel cap but that model uses a separate line with a Duck bill vent (usually a green rubber inside that piece in picture). Part number for that is 574859301 . Your blower should run ok with out it but could leak fuel. If you are going to order any parts for your blower do so using Model # PPBP30 Your parts will be cheaper. That particular model has exchanged hands between MTD/Mcculloch/Bolens and Husqvarna/Poulan over the years. The parts are cheaper when you use the Husqvarna/Poulan model # PPBP30. Only noticeable difference will be a yellow starter housing if you buy a starter assembly.

Check your fuel filter is clear, although as its only 2 years old shouldn't really be a problem but that depends on how good the fuel is. Also check the fuel tank itself is "breathing". Run the engine for a while and open the fuel flap and listen. Do you hear a sound of air being pulled into the tank. If so it isn't breathing and the breather needs clearing (I took my fuel cap to pieces and cleaned before replacing). If it stalls out after idling for a few minutes, try idling with the fuel cap open (be careful though) to see if it runs fine.

Sounds like the fuel cap on the 435 is not venting properly. Change the fuel cap and do not overtighten. Should correct your issue. The 435 is a nice light weight unit.

The tank breather is on the right hand side of the fuel tank, it is a long black tube covered over with a white porus pellet, the best way to push it out is with a pair of curved nose pliers, open the fuel cap, drain the fuel, use the pliers through the open filler hole, the breather tube is located in the roof of the tank, grab the tube and push it out through to the out side, it can then be pulled out between the gap under the crankcase. The new breather can then be pushed in from the outside.

The breather is made of a sintered brass plug and beneath this ia what i call a duck bill valve ( because it looks like a ducks bill ) this is a one way valve green in colour which allows air one way into the tank, to test correctly you should do a vacume test via the fuel hose, to remove the valve will normally destroy.

Cetain breathers are what they cakk duck valves, they will allow air one way, however they will not allow pressure out, they are designed to work this way, if it is flooding that bad it is more likley the inlet needle in the carb leaking.

There tank vent is in the top of the fuel tank, you would have to remove the tank to get to it, it is a small plug and a duck bill valve, as this system only allows air into the tank and not out, there will always be a pressure in the tank, if the carb is flooding it is due to the rubber tipped needle under the metering diaphram leaking, not an issue with the breather, you realy need a small bulb pressure tester to test the needle seating, apply 2/3 psi into the fuel inlet conection on the carb, the needle should hold this with no like on the tester dial, if you do not have a tester all you can do is replace the needle and hope you have cured it, do remember that when re fitting the diaphram and gasget back on the carb, the gasket must go on first, and the diaphram last, it acts as a spacer, if you fit the other way round it will flodd because the diaphram is too close to the needle, the metering lever should be set level with the sides of the carb.

The vent on the 372 is not in the cat, it is situated on the right hand rear side of the fuel tank, the early vent was a black pipe pressed into the tank with a white ( vion ) plug in it, this can be pulled out by screwing a self tapping screw into the middle of it and pulling out with a pair of pliers, the later breather is in the same place but consist of a green valve pressed into the tank, it then has a black pipe conected to it which comes up into the crankcase and sits onto a nipple under the air filter, this can be pulled out with a pair of pliers and replaced, the later breather is very prone to blocking, due to CE law and gas escape from fuel tanks the breather is very fine.

I think your on the right track
Blowing compressed air through your tank vent
is great but it is way more air than the natural asperation
that the saw pulls on it own
I would replace the vent cap and also look for a pinched fuel line between the fuel tank and the carb

Hi

First check the fuel filter ,inside of the gas tank:After that, try to find out where is the airating sistem(gas tank vent):For example a hose with a sprig into it,or any other sistem. Check it.

best regards savumihai71