Re: Re: Your carb should NOT leak......Carb 101

Posted by Bob on February 03, 2004 at 12:27:36 from (66.163.134.177):

In Reply to: Re: Your carb should NOT leak......Carb 101 posted by Why do they leak?? on February 03, 2004 at 12:00:23:

On a carburetor such as the one in the link posted there are only a few possible causes for the carb to leak when the tractor is sitting unused.

1.) Gas leakage that passes THROUGH the needle and seat, due to foreign material in needle and seat, or damaged needle and seat, including wear or scuff marks on the needle that cause it to jam in the bore of the seat when lifted by the float.

2.) Gas leakage that passes THROUGH the needle and seat, due to a leaky float that has gasoline inside, a bent or damaged float that catches against the side of the float bowl, and doesn't lift and tightly close the needle. Some carburetors have a FLOAT DROP adjustment that, when properly set, prevents the float from dropping clear to the bottom of the float bowl and jamming there when the float bowl is empty.

3.) Gas leakage that does NOT pass through the needle and seat. This might be due to a defective or missing gasket between the seat and the carburetor top cover, or the seat not being SECURELY TIGHTENED into the upper carburetor body. In rare, freak cases, there could be a flaw in the casting, allowing the gasoline in the passage fed by the fuel line to leak into the float bowl. I believe the bad or missing seat gasket, or inadequate tightening of the seat are a couple of the more common causes of a carb that drips.

Anybody else have other causes of carburetor leakage to add?

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