For mine, the reason it had a problem was there is a little retainer ring that the line goes through that is attached to the screws that holds the top of the carburetor on. Because of the angle that the hose was at going through there and attaching to the tip that the line goes on, it had actually pinched the line to where not enough vaccuum could do the job. The cure was simply to take it out of that ring.
BigE or ****Mike should be able to hook you up on a new carb. Note that though carbs can come with different size jets in it. I've got one that came with a 114 and another that came with a 105. If you get a new carb, make sure the jets in it are the same as yours sizewise and if not, move the ones from yours over to the new carb.
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