Hi RCKen I've checked out the tank pressure as posted. First with a small amount of air pressure blown in and pinched off for around 3 min. Then tank and lines held, tried again with more air and again it held. I've also put some thin foam between the firwewall and the fuel tank. I think this also takes care of the possibility of a split hose as mentioned by The Ghost. Too late to try it out again tonight. Don't think the neighbours would appreciate it.
If this doesn't take care of the problem I'll try coolbean's suggestion. Hopefully the local hobby shop will have it in stock.
Thanks for the troubleshooting.