Fuel sender for 37 Ruby

[A7JoJo]

I am refitting another fuel sender but will need to replace the screws and seal. What size are the thread and length are the 6 screws and what type of seal should be fitted. Many thanks.

[Nigel Ricardo]

Cork gasket available on eBay, I used Meccano screws

[Parazine]

Cork gasket available on eBay, I used Meccano screws

Which is 5/32 BSW.

[A7JoJo]

Thank you for your advice.

[David Cochrane]

I thought that the screws were 3BA?

[Hedd_Jones]

As above I've always used Meccano screws. 5/32 BSW

Some classic parts suppliers sell 5/32 UNC for this purpise. Same tpi, different thread form, but near enough.

[Parazine]

I thought that the screws were 3BA?

The difference between 3BA and 5/32" BSW is quite small. I always thought these screws were 3BA but the topic was explored at length on the old forum I think and the consensus was 5/32" BSW.
I'm not sure how widely used BA threads were pre-war, they tended to become more common after the unified threads were introduced, post war, when 2BA and 4BA seemed to predominate.

[A7JoJo]

I have just received the pack of 5/32 screws which fit . They are too long but can easily be cut to size. I have ordered the gasket which is the same as the ones used on Land Rover fuel tank and other vehicles. I purchased it via an e fly search. Thanks for the advice from the forum.

[David Cochrane]

I'm not sure how widely used BA threads were pre-war, they tended to become more common after the unified threads were introduced, post war, when 2BA and 4BA seemed to predominate.

As far as I know, 2BA & 4BA were used in the  1920s & 1930s for electrical equipment and for attaching instruments to metal dashboards.