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Originally Posted by Cobra Dude
So what is that thing in your filler cap? A separate cap that has to be removed for filling, or...???
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Yes, that's exactly what it's for. It caps off the smaller tube running up to the filler cap and it also prevents leakage should you fail to keep the shiny side of the car up. I suppose you could fashion a separate tube to fit in yours and use a special epoxy (gas tank sealant type) to help seal it around (don't weld it

). Or you could just not fill your tank up past about 7/8's full.
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Originally Posted by jwd
How is your tank vented?
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There are two vent tubes on the filler pipe below the flange visible in the pic. One goes in to the tank, one goes down to the bottom of the car, and they inter-connect through the top of the filler pipe. There is also a water drain line attached below the flange at the lowest point.