Is this the CMP fuel tank changeover tap in the cab floor you are seeking advice on?
The one I had in my first Ford CMP was a tapered brass affair with an 'o' ring at the top. I lapped the tapered surfaces in with valve grinding paste to ensure as perfect a seat between the two surfaces as I could, and used a modern O ring seal. I checked that the lapping in was complete by using bearing blue to see that there were no gaps in the seating between the two surfaces. Took ages to complete the process.
Worked fine: very, very minor weeping but no air suction.
Mike
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