Question about Yard Machines Tecumseh 148cc Front Tine Tiller #21a 251e000

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Float spring on tecumseh Carb.

There is spring that is for the float. The float pin runs through it and some how keeps the float from bouncing. I can't find anything that shows how it connects the carb. body or float to work properly.

Posted by steveangela0 on

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  • Anonymous May 11, 2010

    Do you have a model and spec number??

  • Jeff S
    Jeff S Dec 11, 2013

    I don' believe the answer provided addresses the issue, which I have as well. All the other applications I have used that spring which the pin goes thru to attach to carb body as the pivot for the float - somehow is spring loaded to help the float either close or open more easily than if the spring were not there. I suspect I have restated the original question showing where Dustin really did not answer it. I as well do not have an answer yet .... Mine is on a 5 hp Sears snowblower with the tecumseh engine .....

  • Jeff S
    Jeff S Dec 11, 2013

    Ok just looked up the part name, one seller on Ebay has this, it is called a float dampening spring, tecumseh part # 632386.



1 Answer

Dustin Reuber

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Ok, that pin is the needle valve. It should move freely, and the spring should attach it to the float. When the carburetor bowl is full, the float pushes that pin up to shut off the gas flowing into it. Otherwise, it would continue to dump fuel into it until it overflows, and you would have gas all over. The engine draws gas through the jet in the bottom of sump that you see sticking into the bottom of the bowl(this likes to get plugged up and keep your engine from running) The spring just kind of sits in there so that if the float moves, it will pull down the pin as it moves.

Posted on Feb 01, 2010


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Hi v0lten...
Yes the problem with the mower not running is the little spring you talked about is missing from under the float arm of the carburetor. It is necessary for the mower to run right.
The little spring inside of the carburetor goes under the float arm.
That is where your fuel inlet needle/float valve is located...on the arm at the end.
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Your carburetor should be working properly to run now as long as you do not have other problems in the fuel system or electrical problems.
Free answer...Please rate me

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