I have a new to me '74 911 and when I picked it up, the guy at the dealer (a classic Porsche repair/dealer at that) told me the little port next to the gas filler is a vent for the gas tank, and that he never used it. However, the manual says that is the wiper fluid port. Also, I nosed around and it certainly appears that the line makes its way into the left wheel well into what I have to assume is the wiper fluid tank.
Normally I would just go with what appears to be the absolute most obvious, and fill it up and see if the wiper unit sprays (currently it does not, but it might also be just empty). But after the comment about the fuel vent from a guy who runs a repair facility, I thought I better make absolutely sure. I mean, if it is NOT the wiper fluid port, then I surely have not been able to locate one otherwise.
Am I crazy? Perhaps, but just in case... I do not want to add water to the gas tank if I am somehow wrong.
