Fuel Pump Relocation

If that doesn't work, www.hoseandfittings.com, go to fittings, then brass, then to pipe-British, then search the combinations. I believe it is 5/16", which is 05 by their nomenclature, but is not very common and in searching I could not easily find any.....
Save it for reference for other odd British fittings, like off the SU fuel pump.
 
Before I get too far into this project, I decided to check out the fuel pump that came with the car. It is a similar shape to the stock SU, however the input and out put are more of a flow thru arrangement, rather than stacked one on top of the other like the SU. It is pretty loud, and it was stamped "Made in China" on the bottom. I am not fond of Chinese made products and have no idea what brand it is.

I was thinking of buying an SU pump to insure that replacements would have a standardized input/output. Are the SU's quiet? Is Sunbeam Specialties the best place to buy one?

If you have other better alternatives that you recommend, I would like to hear that too.

Thanks
 
KettleCarver said:
Before I get too far into this project, I decided to check out the fuel pump that came with the car. It is a similar shape to the stock SU, however the input and out put are more of a flow thru arrangement, rather than stacked one on top of the other like the SU. It is pretty loud, and it was stamped "Made in China" on the bottom. I am not fond of Chinese made products and have no idea what brand it is.

I was thinking of buying an SU pump to insure that replacements would have a standardized input/output. Are the SU's quiet? Is Sunbeam Specialties the best place to buy one?

If you have other better alternatives that you recommend, I would like to hear that too.

Thanks
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The correct SU is priced about the same no matter where sourced. There is a repair guy in San Diego that I have used who may have extra product. Just sayin'
 
0neoffive said:
These comp nuts are 1/2 BSSP . The transfer nipple measures 1/2” diam and I suppose you could do the math and count the threads per inch with a good magnifier.

View attachment 18929
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No they aren't! 1/2 BSPP is 14 threads per inch. I just pulled a spare crossover tube out of my stash... The threads are 20 tpi. They are parallel, not tapered. I did find a brass nut (early Mk1), later cars used a steel nut. A lot of fittings (fuel, oil pressure lines) on British cars used Whitworth wrenches and have weird thread counts.. I guess this is one of them! Baffles me, I couldn't find any type of tubing fitting with a 20 tpi thread count in parallel type. No wonder they're hard to find. In any event, I do have a spare!
 
Finally figured out the thread type. It's called UN for Unified National. The fitting size is 5/16-20tpi. Tubing and pipe fasteners are sized based on the tubing or pipe and not the diameter of the threads... Unified National is a British thread system and it makes total sense as they refer to their screws and bolts as UNF and UNC. F=fine, C=coarse. UNF/UNC is the same as out SAE/USS
 
Austin Healer said:
Finally figured out the thread type. It's called UN for Unified National. The fitting size is 5/16-20tpi. Tubing and pipe fasteners are sized based on the tubing or pipe and not the diameter of the threads... Unified National is a British thread system and it makes total sense as they refer to their screws and bolts as UNF and UNC. F=fine, C=coarse. UNF/UNC is the same as out SAE/USS
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Thanks for the info. It is starting to make more sense now that I know the difference between UNF/UNC.
 
I ordered a new SU fuel pump and fittings yesterday. I still need to source the fuel line. I am leaning toward using stainless steel.

I was thinking of using fuel rated teflon tape on the crossover tube to fuel line connection. Or, do yo guys use something else?
 
KettleCarver said:
I ordered a new SU fuel pump and fittings yesterday. I still need to source the fuel line. I am leaning toward using stainless steel.

I was thinking of using fuel rated teflon tape on the crossover tube to fuel line connection. Or, do yo guys use something else?
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No sealant of ANY kind at the unions.
 
KettleCarver said:
I ordered a new SU fuel pump and fittings yesterday. I still need to source the fuel line. I am leaning toward using stainless steel.

I was thinking of using fuel rated teflon tape on the crossover tube to fuel line connection. Or, do yo guys use something else?
Click to expand...
Just a heads up: On occasion, I've noted that those supplied out/in fittings have incomplete machining. Quite often the 5/16" line connection does not have the correct "pocket" for the tube to slide in nor the bevel to catch and seal the compression union. It's easily solved with a couple of drills but we shouldn't have to do that.
 
0neoffive said:
Just a heads up: On occasion, I've noted that those supplied out/in fittings have incomplete machining. Quite often the 5/16" line connection does not have the correct "pocket" for the tube to slide in nor the bevel to catch and seal the compression union. It's easily solved with a couple of drills but we shouldn't have to do that.
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I've had the same problem
 
The new SU fuel pump came in today. What are those 2 silver fittings for? Some sort of vent? What are they connected to?

SU fuel pump.jpg
 
nothing on the top one. the one near the base had a clear tube Like the w/s washer hose) and it gets routed through the hole on the RH side of the bulkhead in the trunk
 
Austin Healer said:
nothing on the top one. the one near the base had a clear tube Like the w/s washer hose) and it gets routed through the hole on the RH side of the bulkhead in the trunk
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The top one in the photo or the top one on the pump (asking for a friend):)
 
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