Here is a pic of a fuel tank breather set up. The filler pipe obviously is where you stick the bowser nozzle in & fuel goes to the tank. The rubber hose runs from a secondary pipe ( a nipple if you will) up as close as practical to the outer end of the main pipe. This runs down to a nipple (theres that word again ) in the fuel tank. Set up properly this will eliminate blowback provided the main fuel delivery pipe is free of kinks & obstructions. Not standard in early Mustangs but easy to set up. The filler pictured is from an Rx3 sedan. Some welding is required & if you are using a tank that has had fuel in it EVER then a radiator repair place is probably the best place to take your tank to, to carry out any welding. I wont explain what you need to do to safely weld it yourself because if you ozbilt it up, well it wont be pretty. This thread is from a discussion on Ricks "Well Why Not" thread.
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