Why does the carburetor overflow?

Asked by Nov 09, 2012 at 08:44 PM about the 1961 Mercury Comet

Question type: Maintenance & Repair

I have a 1961 Comet  232 with a holly carburetor.  It runs fine but after a minute or two gasoline starts spilling out of the top of the float chamber.  The float valve seems to be working in spec.  Is there another possible cause for the overflow?

3 Answers

108,825

Have you upgraded your fuel pump? Might be more pressure than float valve can hold back. Also check seat where float valve closes and also tip of float valve. Just a small amount of trash or varnish on either could cause the same issue. Hope this helps.

2 out of 2 people think this is helpful.
1,235

Float level could be set too high as well.

108,825

Did not think of that. Float level is more likely the problem.

1 out of 1 people think this is helpful.

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