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I had problems with my machine (about 5 years old) this past winter. It has only been used about 6 times since I've owned it. It was surging quite a bit this season but than clonked out and would not start. Shovel the driveway and tried to fire it up the next day. Ran for about 4 minutes then clonked out again. Ran some Seafoam in the gas tank and seemed to help a bit. Cleaned the carb changed spark plug etc and no improvement.
Today I replaced the carb ($100+) and exactly the same issues. However, Intrigued to find the answer, I opened the fuel valve and watched the flow of the gas to the carb. Shouldn't it run full gussto through the 1/4" line to the carb? As the float should regulate the amount allowed into the bowl. Mine was very slow - so I figure it is a blockage in the fuel delivery. Will start exploring tomorrow.
If you have some suggestions, please e-mail me. [email protected]
 

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One thing that can cause problems is a bad fuel cap. Does it run okay if you unscrew the fuel cap? If so it isn't venting properly and needs to be replaced. A quick fix is to just drill a tiny hole into the gas cap.
 

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One thing that can cause problems is a bad fuel cap. Does it run okay if you unscrew the fuel cap? If so it isn't venting properly and needs to be replaced. A quick fix is to just drill a tiny hole into the gas cap.
First try switching gas caps or use a paper towel and elastic band over the top. If the same, it's not the gas cap, could be a clogged fuel line.
 

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Not sure if you were watching flow with the line disconnected, or the bowl off, but if the latter, note that the needle valve opening is probably closer to 3/32" tham 1/4, which will be the biggest limit in flow. If the former, perhaps the line is breaking down and closing up internally - changing the line is quick, cheap, and easy on most machines . . . Might also check flow with the line off the tank in case any internal filter may have gunk in it.

On another note, I've also had this happen with crap in the bowl plugging the mets when running, but falling clear when not running, but un;ess the crap is still in the line, the replacement carb pretty much ruled that out.
 
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