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 Posted: Apr 27, 2020 03:04PM
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US
It more or less seems to fit the BSF standard as a 5/16-22.  I don't know if our host sells any but Moss does (part 311-140).  Unfortunately, Moss is currently not shipping anything due to Covid-19.

For future reference, see the page linked below.
https://mossmotors.com/nut-fuel-pump-blanking-plate

Doug L.
 Posted: Apr 27, 2020 11:07AM
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A British scrap yard would probably be a good bet.
If I was going to use that, I think I'd file the threads down, then re-thread it to an standard thread size.

 Posted: Apr 27, 2020 10:55AM
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Yes, Wentworth or BNF I would guess. So, How do I go about buying these?

 Posted: Apr 27, 2020 10:52AM
 Edited:  Apr 27, 2020 10:53AM
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As for "measuring" the Threads, That did not work, I can come close, but no cigar!
I even had a thread gauge that came with my Tap & Die set but i Can't it to fit either. 

 Posted: Apr 27, 2020 09:35AM
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I think those are whitworth threads....neither a fine or course thread US nut fits them

 Posted: Apr 27, 2020 08:30AM
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Get  a ruler and place it under the male thread. That is your diameter. Now count the number of threads for 1/2 inch, then double that number. That is you thread count. Those two number are your male thread size.

 Posted: Apr 27, 2020 08:21AM
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Can anyone tell me the proper thread size for the male thread on this solenoid? Please?