Gentlemen,

Thanks for the replies. Since that initial post, I've been doing additional reading, and went so far as to dummy up the forward fuse cage. As it turns out the engine to be used (OS 40FX) when mounted on stock mount inverted puts the spray bar approximately 1/8" above the centerline of the tank (DuBro S-8). This seems to be at least serviceable. The muffler is completely external to the fuse on the left side and the needle valve exits on the right side about 3 1/2" behind the prop. I'm thinking that routing the fuel/pressure lines through the firewall say 1" above the tank centerline it would help to break any syphoning. That would then leave only the issue of the cylinder loading up fairly easily, but I guess I'll have to deal with that when the time comes.

Thanks again for the help.