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b
Bob Hughes
Feb 20, 2017 - 10:36PM
AC Petrol Pump threads

Can anyone please advise me of the thread type used on the inlet and outlet ports on the T type AC petrol pump.
The actual union has a BSP thread on the outer connection and an unknown thread on the inner part (the piece that screws into the pump) this is the one I am looking for.

Thank you
Bob

Location: South Bucks

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Feb 20th, 2017 - 10:36 PM
b
Bob Culver
Feb 21, 2017 - 4:09AM
Re: AC Petrol Pump threads

Probably 1/2 inch SAE, (now UNF) 20 tpi

(Incidentally this thread is slightly larger than the 12mm on 26VA carbs and near identical pitch and often a saviour.)

Location: Auckland, NZ

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Feb 21st, 2017 - 4:09 AM
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Bob Hughes
Feb 21, 2017 - 8:59PM
Re: AC Petrol Pump threads

Bob, Thank you for the advice, the 1/2" UNF whilst not exact worked fine.
Best Wishes
Bob H

Location: South Bucks

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Feb 21st, 2017 - 8:59 PM
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Bob Culver
Feb 22, 2017 - 1:43AM
Re: AC Petrol Pump threads

The SAE thread (and the old ANF) is cut slightly deeper than its successor/s; precise female threads may need easing with a drill to fit UNF.I presume old carbs are SAE but dunno if strictly retained for later.

Location: Auckland, NZ

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Feb 22nd, 2017 - 1:43 AM
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