Now that I’ll have a chance to drive my ’62 Cutlass after some tidy up & detail work, I filled the gas tank, and the filler neck overflowed pretty quickly. Once it settled at a level just under the cap, I figured it would be O.K. once I burned some off the next day. When I returned to the garage later, there was a large puddle of gas, which had escaped from the neck. Removing the cap, I could see bubbling gas that continued to spill over. Finally, I decided to siphon the gas down so there would be none in the neck, and it seems to be fine now. Is there some secret on how to fill these tanks? Thanks, Mike
Well, to me it sounds like you need a new gas cap. Gas will expand and contract with heat and your cap should keep it in the tank. A properly working vented cap should not allow the gas to escape. You should be able to get a new vented cap that fits at the local auto parts store.
To update the info on my issue, here is what I found, and the solution. I dropped the gas tank a few inches to see what was going on with the breather hose. It was very clear what the problem was, as the hose was kinked in at least three 90 degree bends. There was no way that the tank could be vented properly to allow it to be filled. I understand what went wrong with the installation, as the hose needed to be pulled from the top as the tank was lifted back into place in order to keep it from kinking. Once the tank was back in place, I filled the tank with no trouble at all. In fact, the gas gauge now also works as it should. If anyone else has had a similar problem with filling their tank or overflows, this seems like a reasonably easy fix.