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I think you have a combination of issues.
Small vent tube on a 1966 912 gas tank. The plastic vent line could be kinked. I don't think the 1966 gas tank had a charcoal system as did the 1969 912 fuel system did. (I think the vent system in a 1966 was just a looped plastic line that vented to atmosphere.) The 1/4 line next to the fuel sender in the gas tank.
Partial blocked gas tank screen. 50 year old gas tank with residue in the bottom.
No swirl pot in gas tank. Chance of fuel pump running dry when fuel gets low in tank. Pulling air into carburetors.
What happens went the gas cap isn't fully sealed? Does the same conditions happen?
I would clean the fuel system starting with the fuel tank and clean and replace all the hoses. OR - pull the sending fuel sending unit out and see if you can see the condition of the filter screen and tank.
Also, check the small fuel hose that goes from the fitting on the gas tank to the tunnel, it could be clogged or collapsed.
Double check the gas tank vent. Does the tank suck in a lot of air when you open the gas cap?
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Dave K
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