The Ford Barn - Fuel Shut-off valve

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JohninKuranda

06-13-2025 09:23 PM

Fuel Shut-off valve

1 Attachment(s)

I am just after clarification as to the thread size on the carb-mounted fuel shut-off valve (the thread marked in purple on the attachment). I am thinking that it is 1/2" - but wondering if it is UNF or NPT? Or is it another size?

Many thanks
John

redmodelt

06-16-2025 10:03 AM

Re: Fuel Shut-off valve

1/2" (US) national fine straight thread.

Daisyarney

07-01-2025 09:00 PM

Re: Fuel Shut-off valve

It’s most likely 1/2" NPT, since most carb-mounted fuel shut-off valves use tapered threads for sealing. However, to be sure, you could measure the thread diameter and pitch with a gauge or check the carb model’s spec sheet. Did you already check if it has a slight taper (NPT) or straight thread (UNF)?

redmodelt

07-03-2025 10:48 AM

Re: Fuel Shut-off valve

Quote:

Originally Posted by Daisyarney (Post 2398165)

No it is a straight thread and uses packing to seal or in some cases a brass ferrule. The other end that fits into the carb is pipe thread.

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