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Fuel line threads
Post new topic   Reply to topic    Classic cars forum & vehicle restoration. Forum Index -> Rootes Group & Original Companies (Hillman, Humber, Singer, Sunbeam, Commer etc)
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1935Hillman



Joined: 06 Apr 2010
Posts: 257
Location: Hampshire

PostPosted: Sat Jul 21, 2012 5:23 pm    Post subject: Fuel line threads Reply with quote

Hi all,
I am renewing the fuel line between pump and carb on the Hillman as the old one is too short and not very well routed around the engine bay and looks all wrong.
First problem to get over.
The existing old brass elbow looks like a particularly fine thread and it is unequal but I don't know what size it is.
To give me a start point I bought a 1/4 BSP fitting from a well know vintage car parts supplier. The thread on one end of the elbow is dimensionally the same as the new one but the thread is finer - 1/4 BSP fine? The other end that screws into the pump is smaller, possibly 1/8 but also a very fine thread.
I've got several old AC pumps and they all seem to have this fine thread in the two fuel holes. Anyone got any ideas as to what this fitting is and where I can get something to fit it?
Many thanks
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ukdave2002



Joined: 23 Nov 2007
Posts: 3368
Location: South Cheshire

PostPosted: Sat Jul 21, 2012 6:05 pm    Post subject: Reply with quote

Your original may be 1/4 BSF ;26 tpi,..... 1/4 BSP are 19tpi

Dave
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1935Hillman



Joined: 06 Apr 2010
Posts: 257
Location: Hampshire

PostPosted: Sat Jul 21, 2012 11:17 pm    Post subject: Reply with quote

But 1/4 BSF major diameter is 0.25" and 1/4 BSP major diameter is 0.518" They are visibly quite different. What I have is the same major diameter as 1/4 BSP but a much finer thread.
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47Jag



Joined: 26 Jun 2008
Posts: 1458
Location: Bothwell, Scotland

PostPosted: Sun Jul 22, 2012 11:35 am    Post subject: Reply with quote

If it's for an AC fuelpump then it will be 1/8 pipe thread. The fittings are usually tapered too.

Art
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1935Hillman



Joined: 06 Apr 2010
Posts: 257
Location: Hampshire

PostPosted: Sun Jul 22, 2012 1:44 pm    Post subject: Reply with quote

Do you know where I might get a couple?
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Kelsham



Joined: 18 Jan 2009
Posts: 349
Location: Llandrindod Wells Powys

PostPosted: Sun Jul 22, 2012 5:06 pm    Post subject: Reply with quote

Would it be possible to use the old ends? I presume you still have them.

I am about to silver solder some to my BSA Four wheeler as someone decided to cut the copper pipe in two.

Not sure why.

Regards kels.
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1935Hillman



Joined: 06 Apr 2010
Posts: 257
Location: Hampshire

PostPosted: Sun Jul 22, 2012 5:33 pm    Post subject: Reply with quote

I could but they are pretty worn. It just seems odd that it is so hard to find fittings for one of the most common fuel pumps?
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RUSTON



Joined: 07 Mar 2011
Posts: 144
Location: Matlock.

PostPosted: Sun Jul 22, 2012 7:17 pm    Post subject: Reply with quote

Have these guys anything suitable, I have had good service from them?

http://www.vintagecarparts.co.uk/categories/vintage-car-parts-taps-pipe-and-fittings-fittings

Pete.
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Measure twice...cut once!
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1935Hillman



Joined: 06 Apr 2010
Posts: 257
Location: Hampshire

PostPosted: Sun Jul 22, 2012 8:09 pm    Post subject: Reply with quote

Unfortunately not
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