Put the whole tank under water with the ends of the tubing coming out. Plug all of the tube openings except one....Blow. If you get any bubbles you have a leak there.

Now, take off the stopper and pull it out of the tank. Blow into the carb line while plugging the clunk. This tests for holes in your clunk line (behind the stopper). If you get any bubbles you have a leak.

Sorry, I should have explained better. [sm=red_smile.gif]