Hi Walfam,

I wrap my tanks in medium density foam and secure with zip ties to 1/4" balsa cross braces so it is easier to remove when necessary. Seems to work fine without foaming, I think the amplitude of the vibrations may increase with distance from the firewall anyway? (I know someone will probably jump in with amplitude vs frequency in the foaming equation)

DaveB has identified that unless you have a pumper type motor/carby or positive crankcase pressure you may have difficulty with fuel flow when the level in the tank gets low. I would first try it without going to hassle of new motors or crankcase taps etc.

One tip I will pass on that I read some time ago, from (Minn?), and have since followed, is to buy a length of the brass fuel tube from your LHS and run the metal tubing from tank through the fire wall. This way all silicon tubes are where they are easier to see and more importantly where when they split the fuel doesn't fill the fuse. I once spent ages filling my Dynaflite PT19 and only stopped when the puddle of methanol reached my knee!!![:@]

Cheers,

Colin