I was exploring the front trunk of my 914 to find a hose of sorts coming out of the carpeted headed wall of the trunk and then screwing into the spare tire valve stem.

Is this a sensor or something?

I am curious to know what it does. The tire was not filled, so if it is suppossed to be sensing something, please let me know.

Thanks,
Andrew

If I remember correctly, the 914's windshield washer system used the air from the spare tire for pressure.

the compressed air in the spare tire is used to pressurize the windshield washer reservoir, to eliminate an electric washer pump (pump available as an option). think "super soaker"

yupp, that means, you only get the windshield washers to work if you have enough air in your spare tire.

there's a valve on the washer bottle cap that will prevent your tire from going flat, i vaguely remeber that it closes at 29 lbs ...
so, in order to operate correctly, your spare tire needs more pressure than that.

Andy

Yup I think the manual says to fill the spare to 43 lbs.