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Tank should not have a breather, the fuel cap does that function. Check your fuel lines and where they penetrate the tank. Today's fuel will eat the fuel line over time and there is also dry rot. The fuel lines on these need to be monitored over time to ensure continued safe operation of small engine equipment.
The tube in the tank is the fuel pickup line and goes directly to the carburetor. You will need to get NEW fuel lines. Fish or shake the old parts out of the fuel tank after draining. Inside the tank will be a small length of smaller diameter fuel line that connects to the small fuel filter and there will be a small nylon line connector that is plugged into the end of the larger diameter fuel line which is the fuel return line from the primer bulb back to the fuel tank. That line ends just inside the fuel tank and is held there by the small nylon line connector. The other line (smaller diameter) needs some length inside the tank so it can flop around as you move the machine enabling it to always pick up fuel. 6" or so is about right from the hole in the bottom (or top) of the tank to the fuel filter. Buy long enough lengths of fuel line that they can be inserted into the tank and pulled thru the fill cap area and then have the parts put back on them and then cut to the correct length from the fuel tank to the carburetor and/or primer bulb. Buy about 1 foot of each size line needed. Small engine repair shops have it and sell it..not expensive.
Empty the tank by dumping into a can or something. Shake the trimmer around until the "nipple" falls out. Get a replacement fuel line and follow their instructions. When yoou put the tube back into the tank, have something that you can guide the line through the hole with. I used a small hex wrench. If you cut the tip of the tube at a sharp taper, it will be much easier to start through the hole. You might think of replacing the return line as well. You should not have to remove the tank if you expose the carb and remove the air filter...Good luck...Lee
If the rubber stopper is still plugged into the tank pry it out go to a small engine shop and buy new gas line.Thread the new line into rubber stopper to poper length,plug filter (new)on end that is going in tank then pop he rubber stopper back into the tank body.Have done hundreds and it isn't hard,you may need sone WD 40 on stopper to thread line and popping stopper back in .Good Luck
when you prime the bulb it sucks gas from the tank with the small tube, any excess gassed pumped will be fed back to the carb via the big tube leading to the tank. If you prime it and the bulb stays pushed down, then you have a clog or kink. To fix , pull the small tube out of the tank through the fill hole. Pull off the filter on the end and put the tube back in the tank. If it primes, your fuel filter was clogged. If it still wont prime check the hose going to the carb and make sure isnt clogged or kinked.(take of carb and blow in it). If that doesnt fix it take off the bulb from the carb with two screws. The bulb assembly will come off too(rectange metal thing) Take off the two black gaskets, be carefull with them. Take off hoses from carb and bulb asembly. Blow carb cleaner in all holes and over surface. Put back together. If the carb wont prime and the bulb isnt staying depressed. then you might have a bad bulb or carb gaskets. Make sure hoses are not cracked, cloged, or pinched.