| Fuel tank safety Simon
The foam I used is called "explosafe foam" and is a reddish orange color, and said to be safe with gasoline and alcohol fuels. Also as Andy said leave room for your sender travel, if this is a problem there are senders available that move vertically thru a tube, and the foam nearby is not an issue as there are no moving parts outside the sender. Hope some of this helps.
Cheers
Phil |