For IVA i understand that fuel and brakes can be run together through the tunnel but not loom and fuel? I am building a Tiger avon that has limited space through the tunnel, no mater how i run the fuel brakes and wiring, somewhere in the tunnel the wiring is going to cross the fuel line.

is this going to be an issue when IVA comes, they are seperated and individually wrapped through the tunnel, they will just cross at the front of the tunnel.

cheers

I was dead worried about this, but having just stripped down an MGB I think I worried too much!
My wires and fuel line cross in the tunnel. I spent ages worrying about it and trying to route them so that they didn't cross, but couldn't. I kept them separate with a home-made ally bracket, mikalor p-clips on the bracket keep each apart. The wiring is wrapped and then covered in convoluted sleeving, the fuel line is braided but I stuck some convoluted sleeving on top as well where the two lines are close, since it's dirt cheap.
Massively overengineered I'm sure. I'd say, just clip them, and if there's any chance of them rubbing, use extra sleeving. I had no comments on it at IVA.