SWB Fuel Tank Fitting Size

[SBell]

I'm in the slow process of preparing my 67 912 for my 2.7 MFI motor and updating the fuel system with an electric pump and return line to the tank is first on the list.

I haven't been able to nail down what size the middle fitting is on the tank. It seems to be either M12 or M14. Does anyone have a SWB tank with the small breather fitting sitting around they could measure for me. Size and pitch would be ideal but I can back it out even with a simple ID measurement.

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[nickelplated5s]

I happen to have a 67 912 tank here. Replacement courtesy of our host. 20mm id. Probably course thread for the left and right fittings. Probably 12mm for the center. My micrometer said 11.8ish but that would be for the outside threads.

[SBell]

Perfect, thanks! That's exactly what I needed to know.

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[Bend911]

I installed the Dansk 100L tank and the fittings look the same. I have an M14x1.5 plug in the middle hole. I believe I used M22x1.5 to AN-6 adapters for the two side holes. Hope that helps confirm sizing for you.

Lucas