Those are good tips on the carb end. Thanks, I'll check those out.
Unfortunately, I've ruled out the Carb as the source of the problem because the gas in the filter bowl still disappears when the fuel line between the outlet on the filter and the inlet on the carb is disconnected. (It does it with the filter connected to the carburetor as well)
It almost looks like it's backflowing out the inlet on the filter and back into the fuel pump on the side of the block.
