Posted by beargap on June 21, 2012 at 03:04:30 from (50.29.229.183):
In Reply to: Cub stops when hot posted by beargap on May 05, 2012 at 16:15:29:
Follow up on this issue...
I did replace the coil, but that made no difference (the new coil gets hot, too, for some reason). Fortunately, I needed a coil for an old "74 vintage GMC farm truck, so nothing lost there.
I noted the inline fuel filter on the Cub would be empty when the engine quit, then slowly refill as it sat with the engine off. However, if I pulled the fuel line off the filter outlet, fuel would flow freely. Next I took the carburetor apart and cleaned it, replacing the gaskets. Again, no change, and the cub would still starve of fuel when hot. On one stop I noted bubbles in the fuel filter and suspected vapor lock, but wiggling the fuel lines (which never leaked fuel) would change or stop the bubbling. Now suspecting an air leak, I replaced the fuel line and eliminated the inline filter (OEM never had one, anyway) and while working the tractor in very hot conditions yesterday it never stopped or hesitated. I think the seal around the filter (no clamps on either side) must have gotten bad when hot and allowed air to get sucked in, creating, in effect, a vapor lock condition without actually boiling the gas. So, now one less item to service and, hopefully, many more years of use.
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