Specifications

Addendum 3/9/2009
Member "stevesemti" has identified another potential float system defect. In pre-'78
carbs, the float chamber is vented at the bottom of the float bowl through a brass pipe
seated in the float bowl, which opens above the correct fuel level. It prevents vacuum
from forming as fuel level drops and drains off excess fuel in the event of overflow.
Steve traced a fuel leak through the vent (usually caused by float level or float valve
problems) to the seat of the vent pipe (below fuel level in the float bowl). He reports that
attempted repair with JB Weld slowed the leak but didn't stop it. Any fuel leak is a
dangerous condition. It might be possible to use a micro torch to sweat the pipe to the
seat with solder. Failing that, the float bowl should be replaced. Thanks for the heads-
up, Steve!