New tanks w/relocated filler
When I used to sell auto parts a million years ago, Gates fuel fill hose was outrageously expensive and you had to buy it in a 3' length. Most applications only required a 6" or less piece so I expect that's why a lot of people used radiator hose. You might luck out, tho, and find a chunk still attached to a fuel filler at your favorite junkyard. However, most of the junkyards I've been to lately remove the tanks before the cars ever get out to the yard. I'd still be tempted to revisit the copper pipe idea. I could see where it would be a problem if your fuel filler is already cut in the hood and you're trying to align to it. Might be easier to trailer the whole thing to your tank guy(no relation to "Tank Girl", I'm sure) and let him do the final alignment, but then there's the cost/hassle factor.
It still sounds like the best/simplest solution is to block off (weld) the old filler, relocate(weld) a short 2" dia. filler neck tube on the top aft side of the tank and connect it with a short straight length of fuel hose to a quality filler cap assembly mounted on the hood. It will give maximum fuel capacity and if correctly assembled have about zero chance of ever leaking. A fuel tank, which is located fairly close to the back side of your instrument panel isn't something you want to experiment with "maybe good enough" components. The best tank to weld on is a new one, but old ones can be safely welded if they are filled with water.
Hi Cairomanx this may sound like a stupid question..but I have a stock 62-67 tank that I need to cut the original filler neck off of and weld it in the back-center of the tank like the one pictured in one of the first posts of this thread..the tank hasn't had gas in it for years so I'm not worried about it exploding when I weld the new neck to it but why would I need to fill it with water while welding it? thanks
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While we are on the subject, I noticed that the angle at which my tank is installed, is down hill torwards the front. The outlet is pretty far torwards the firewall. It looks like the gas at the forward part of the tank has no chance to ever move up stream to the outlet. Does any one know if this is just the way it works or does the tank fit flatter in an orginal bug?
[QUOTE="bountyhunterdm"]does the tank fit flatter in an orginal bug?[/QUOTE] Yes in a bug the tank sits flat and in a Manx the tank is tilted forward. That's one reason you need to relocate the filler from the front to the back, so you gain a gallon of capacity. However, even though the outlet valve isn't on the very bottom of the tank, there is just about a cup that you can't get out. Even in a bug there is still a few ounces left.