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  #1  
Old October 15th, 2017, 06:58 PM
slorocco
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Dan Prasada-Rao
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Thread size question

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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  #2  
Old October 15th, 2017, 08:49 PM
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Charles Galpin
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Dan, would it be the same fitting as a side tank on a 63 109? If yes, I can see what mine is
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  #3  
Old October 16th, 2017, 06:35 AM
slorocco
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Dan Prasada-Rao
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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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  #4  
Old October 16th, 2017, 07:02 AM
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John B.
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It will probably be Whitworth.
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  #5  
Old October 16th, 2017, 07:05 AM
slorocco
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Dan Prasada-Rao
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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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  #6  
Old October 16th, 2017, 08:32 AM
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1/4" hose should be tons.
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  #7  
Old October 16th, 2017, 08:58 AM
slorocco
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Dan Prasada-Rao
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Quote:
Originally Posted by Red90 View Post
1/4" hose should be tons.


Everything on the engine is 3/8, starting with the first fuel filter, fuel pump, and second fuel filter.
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  #8  
Old October 16th, 2017, 04:51 PM
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Charles Galpin
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I have both metric and standard thread checkers, but not whitworth. So not sure I can help.
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  #9  
Old October 16th, 2017, 05:17 PM
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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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  #10  
Old October 16th, 2017, 05:23 PM
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Jack Walter
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Agree with RD, probably BSP British Straight Pipe
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  #11  
Old October 16th, 2017, 05:31 PM
slorocco
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Dan Prasada-Rao
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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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  #12  
Old October 16th, 2017, 09:07 PM
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Dan Prasada-Rao
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Quote:
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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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  #13  
Old March 27th, 2019, 04:15 PM
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Jack Walter
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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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  #14  
Old March 27th, 2019, 04:27 PM
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John B.
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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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  #15  
Old March 27th, 2019, 04:36 PM
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Jack Walter
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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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  #16  
Old March 29th, 2019, 08:44 PM
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David Porter
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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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  #17  
Old March 30th, 2019, 07:27 AM
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Jack Walter
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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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  #18  
Old March 30th, 2019, 08:00 AM
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John B.
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Is there an echo in here?
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  #19  
Old April 1st, 2019, 05:00 PM
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Jack Walter
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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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