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1935Hillman
Joined: 06 Apr 2010 Posts: 257 Location: Hampshire
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Posted: Sat Jul 21, 2012 5:23 pm Post subject: Fuel line threads |
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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: 4105 Location: South Cheshire
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Posted: Sat Jul 21, 2012 6:05 pm Post subject: |
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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
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Posted: Sat Jul 21, 2012 11:17 pm Post subject: |
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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: 1480 Location: Bothwell, Scotland
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Posted: Sun Jul 22, 2012 11:35 am Post subject: |
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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
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Posted: Sun Jul 22, 2012 1:44 pm Post subject: |
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Do you know where I might get a couple? |
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Kelsham
Joined: 18 Jan 2009 Posts: 349 Location: Llandrindod Wells Powys
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Posted: Sun Jul 22, 2012 5:06 pm Post subject: |
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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
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Posted: Sun Jul 22, 2012 5:33 pm Post subject: |
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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.
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1935Hillman
Joined: 06 Apr 2010 Posts: 257 Location: Hampshire
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Posted: Sun Jul 22, 2012 8:09 pm Post subject: |
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Unfortunately not |
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