Hi Jim,

Thanks a million for your good advice.

I talked with an old mechanical friend of mine earlier this afternoon, and described my problem.
He was of the strong opinion that the problem probably lay within the fuel tank, since no external leaks were observed.
I just decided to do a bit of research on bubble-less clunks and guess what....I may have found the perfect solution.

Check out this amazing but simple system to do away with all the troublesome bubbles.[:-]

How to Build a Turbine Pleated Paper Clunk
By Mark (Rocketman) Pokrywka & Steve Ellzey

http://www.jetpilots.org/how_to_buil..._pleated_p.htm

I am heading for my local Auto Parts Store tomorrow for the suggested part and plan on using
the - second option - suggested in the above article.

I'll post my results just as soon as I can get it set up.

I really hope this works........this may be a godsend for many RC Flyer's facing this dilemma!!!

Once again.....many thanks Jim for steering me hopefully in the right direction.

DDriver.