Does anybody know where i can buy some 3 1/2" id petrol proof hose, only need a couple of inches to join my filler neck to the tank. I was going to use a samco, until mrsilicone on ebay informed me that it wasnt fuel proof

Try a Marine parts company!!

carbuilder solutions or europa spares do rigid and flexi hoses.

Try Burtons

www.burtonpower.co.uk

they sell generic fuel filler hose

Think Aotmotive do it too Link

None of the above seem to go above 2 1/2" unless theres a marine supplier i havent found yet. Do you think silicone would be ok, its not gona be sat in fuel, just vapours i suppose and an occasional splash. Ive seen people use it to mount carbs, prob quite a similar situation.

I have some and I would be willing to sell a few inches

I will double check the dia and let you know.