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Re: What are the fuel Tap threads on a '41 M20

For my breather pipe, which thanks to Ian we’ve established is BSC Coarse 7/16 diameter 20tpi. I only managed to source a 7/16 diameter 19tpi fuel pipe union (the ones that fit the Enots fuel taps, also discussed in this thread).
Using a 1.25 pitch metric thread file (60 degree thread form like BSC, much cheaper than a BSC thread file and has got me out of trouble with lots of BSC thread issues) I’ve ‘eased’ the thread in the union. So it now screws onto the breather with slightly more effort than my sausage fingers can produce. I’m happy with this compromise. Once my workshop is built and I have bought a lathe, such things will be a thing of the past!

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