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Discussion Starter #1
Can anyone help with the right thread size for the fitting on the top of the fuel pick up tube? I have a 63 109 station wagon with the rear mounted fuel tank.

Thanks in advance.
 

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Discussion Starter #3
Yes, I believe it's the same.


I first thought it was a UNF 1/2" 20 thread pattern but those don't quite fit. The female rover part will thread on to a male UNF 1/2 20 male part. But the female UNF 1/2 20 will not fit on to the male rover threads coming of the top of the pickup tube.








I'm now thinking it may be an old BSP 1/4 thread pattern.
 

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Discussion Starter #5
Yeah, that's what I'm thinking too at this point.


I'm trying to increase the fuel line size. The stock rover stuff comes off of that fitting with a 1/4 in fuel pipe. I'd like to step it up to a 3/8 pipe to better satisfy the needs of the Cummins 4BT.
 

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To add...
It could also be straight British pipe thread.
The good news the threads are straight and not tapered.
 

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Discussion Starter #11
Thanks for checking Charles. Robert, I think you nailed it. Straight threads with an outer diameter of .51 inches which matches up to the specs for 1/4 BSP
 

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Discussion Starter #12
Agree with RD, probably BSP British Straight Pipe
Thanks Jack, I think you and Robert are correct. I found what I think I need from Pegasus Racing. They have some fittings in BSP sizes. Hopefully it will work. $20 plus shipping for one fitting!
 

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I'm struggling with this issue myself now - I got the 1/4" BSP banjo bolt from Pegasus and it was way to large to even start in the threads in the fuel pump. I'm trying to plumb up the pump to Rochester carb with AN fittings and a 12mm x 1.25 banjo bolt is noticeably loose but 1/4 NSP and 1/4 BSP are too big.



Major diameter of the compression nut for the olive on the plastic fuel line measures about .491" - that's the piece of fuel line I have going back towards the tank on the 88". I don't have a line for the exit to the pump at all so I'm trying to plumb something up.
 

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It would help if you told us what engine and part you are discussing.

Most likely is is 1/2" UNF. That is what is used for most land rover fuel connections. The compression fittings they use are Land Rover specific. Most of the 1/2" UNF connections can use a -5 ORB fitting with a copper washer instead of the o-ring.
 

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Oops = sorry - Fuel pump outlet on 1967 Series IIA 88" with the 2.25 4 cylinder petrol engine. It doesn't look like UNF threads though - coarser than that and they appear to be straight threads.
 

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The British threads will have a 55 degree root vs 60 degree for American threads. This holds true for pipe sizes (BSPP & BSPT) as well as Whitworth. Measure the root angle and that will get you on the right track.
 

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I think they are 1/2-20 threads since it's an AC pump, just like the old Stromberg carbs used on flathead Ford engines.
 

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After physically trying every type of fitting I could get my hands on the winner is a 1/2-20 fitting with a tapered seat that is made to provide a 5/16 Barb fitting for a Stromberg carburetor. Part came from Summit Racing, #SBC-9080K-CHR for $9.99.
 

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