Re: Super M Carb Problem

Posted by Bob M on June 17, 2003 at 06:02:51 from (165.170.128.66):

In Reply to: Super M Carb Problem posted by Darian Bookman on June 16, 2003 at 19:42:34:

Leaking like you describe can be only one of two things: The float needle valve not shutting properly, or an internal bowl leak. You can narrow it down like this:

Get a hose barb fitting to match the drain plug at the bottom of the bowl (I think it's 1/4" NPT) and a short (12" or so) piece of clear vinyl tubing to match the hose barb. Shut off the gas at the sediment bulb, remove the bowl plug and temporarily replace it with the barb fitting. Now stick one end of the clear tubing on the barb and curl it upward so the open end is several inches above the carburetor.

Now turn the gas back on at the sediment bulb and observe the fuel level in the clear tubing. It should stabilize about 1/4" or so below the top lip of the bowl (the gasketed joint where the upper and lower halves of the carburetor meet).

If the gas level is at or above the top lip of the bowl, you have a float/needle valve problem. Problem could be float level adjusted too high, float binding/sticking in the bowl, a bad needle valve/seat, junk in the needle valve causing it not to close, or a waterlogged float. You should be able diagnose without removing the carb: Disconnect the air inlet hose and choke rod, remove the 4 screws holding the carb halves together, then gently separate (lower) the bowl from the throttle body. The float and needle valve assembly can then be inspected, removed, adjusted, etc.

However if the fuel level in the tubing is BELOW the top of the bowl while gas drips out the air inlet, is says there's an internal carb leak. Could be a small a small crack/pinhole in the bowl casting, a damaged or cross-threaded main jet, etc. Best to seek help from a reputable carb shop - and NOT the shops you've been using!!

Good luck and hope something here helps...been there a few times myself...

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