Stormin',
If the tank is secured by balsa, yes- take the balsa out, and use some GOOD foam to pack the tank...Not too tight, just enough to hoild it securely. Try to use latex foam, or any foam that is "soft" to the touch. I have used in a pinch, several wadded up bread bags and it worked fine.
Also you may get a few jabs for this one- put 2-3 drops of Armor All in your fuel. It was first used as an industial de-foaming agent. 2-3 drops PER GALLON, as it does contain some things that will cause your glow plug life to be shortened a little if you get too crazy with it.
2-3 DROPS PER GALLON.
Magic.
While you are re-packing the tank, take the time to remove it, and double check the lines, inside too, before you re-install it.

Jetts