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Originally Posted by patrickt
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.
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That may be your problem. As you fill the tank, the displaced air has to be vented or you will get a bubble of air sealing the filler and gas will go everywhere. My vent is attached directly at the top of the tank itself and has a 3/8" hose that runs from there, up to a vent/rollover valve that is mounted approx. 12" above the top of the tank. I had the flip cap with the small cap inside like the first pic. I replaced it with the type in the second pic. because I thought it was kind of a cheesy set-up. I haven't had any problems filling with either cap.