Fuel Tank Sump

ALAN COCHRANE · Post by **ALAN COCHRANE** » Thu May 08, 2014 8:09 pm

Hi
I'd noticed recently that the sump had developed a slight leak over the Winter. I ordered a new seal for it from SNGB (part no C1617).
The old seal fell off in two parts when I unscrewed the sump. It appears to be much larger than the replacement which I had to "screw" onto the threaded outlet on the tank.
Has anyone else replaced the seal with the SNGB replacement?
I also noticed that the sump had some sort of wax/putty around the inside where the top brass section meets the body. This was also repeated on the outside at the same point. I removed the outside seal because it had already flaked off in places. I've leak tested the sump and it appears to be fine-so the wax seems to be a bit of a mystery. Has anyone else come across this before?

Cheers

Alan

ChrisC · Post by **ChrisC** » Tue May 13, 2014 9:49 am

without a picture its a little hard to tell where you see the wax but perhaps a previous owner had filled the cavity into the boot around the sump? There was originally some high density foam that provided the same function but that probably deteriorates over time... but that might account for the wax?

ALAN COCHRANE · Post by **ALAN COCHRANE** » Sat May 17, 2014 11:03 am

Chris

I still have the high density foam under the tank, although bits of it were flaking off everytime I screwed the sump on and off. The mystery wax seemed to have been applied as some form of seal between the steel body and the upper threaded brass section of the sump. I removed all the exterior wax since it was already flaking off, blasted and then repainted the sump. The seal SNG Barratt list as C1617 is the early soft metal type apparently. I couldn't ge the sump to stop leaking with it fitted. I ordered the later rubber seal(C26310) and hey presto the sump has stopped leaking. Interestingly neither seal looked anything like the one that fell off initially. The wax will have to remain a mystery.

Cheers

Alan

ALAN COCHRANE · Post by **ALAN COCHRANE** » Mon Jun 09, 2014 9:08 pm

Hi Everyone

I've just received a new fuel tank sump from SNG. Unfortunately the new sump does not fit onto the tank. I've measured the internal diameters of both and found that the original sump is 39.45mm wide and the new one-38.45mm.
The new sump is also 20mm shorter than the old one.

Has anybody else come across this problem? Is there more than one size of sump?

I've uploaded three links of the two sumps-please let me know if it doesn't work-it's my first attempt.

https://www.dropbox.com/sc/op8ky14c7xn4 ... QOnJAGzIia

https://www.dropbox.com/sc/3yaouae4tham ... UxQwIPXe9a

https://www.dropbox.com/sc/v1jxaw8swir3 ... f6U7rVFOga

Alan

david muir · Post by **david muir** » Tue Jun 10, 2014 12:43 am

Alan,
Send it back and stick with the old sump and rubber washer-if you get a new one to fit you'll just end up with old one lying around your garage that you can't/won't throw away!

ALAN COCHRANE · Post by **ALAN COCHRANE** » Tue Jun 10, 2014 10:07 am

David

That's not an option unfortunately. If you study the photo of the two side by side you'll notice that the old sump is made in three sections. The leak is actually between the middle and top section. When I first noticed the leak, the sump had an external and internal wax seal around this joint. The wax on the outside had started to flake off causing the leak. SNG are checking their stock to see if this is a one off or if they're all this size. I could get the threaded section enlarged by 1mm at my local Engineering Company. The only other option would be if some kind Forum member had a spare original that they'd be prepared to sell-any offers?

Alan

vacbag · Post by **vacbag** » Tue Jun 10, 2014 10:31 am

Alan I had the same problem, I just took the old unit apart with heat and re soldered it back together. If you do not have the facility to re solder then take it to your local radiator shop.
Steve.

Post by **Heuer** » Tue Jun 10, 2014 10:41 am

Preservation is always better than replacement! As Steve says, repair it or get it repaired - it is not that difficult and far more satisfying. Also you don't know what other problems await you with the repro unit when you fit the fuel pump filter.

ALAN COCHRANE · Post by **ALAN COCHRANE** » Tue Jun 10, 2014 11:33 am

Steve

Why didn't I think of that!
Two months ago I had my GT6 radiator refurbished and a longstanding leak fixed at the same time. The repairer also fitted a drain cock and repainted it-all for ?60. The company was called Tayside Radiators and they did an excellent job-if anyone is in need of their services.
I'm going to phone them at lunchtime and see.

David

Yes you're right resotre rather than replace. I've just had the chromework replated and one of the rear light surrounds had two holes blown in it.
It was an original Lucas item and I sacrificed the shiny new look and repaired the holes myself. I've also had to rebuild the bulb holders which fell apart when I dismantled it. So I should be applying the same to the sump.

Cheers

Alan

P.S. Does anyone no a good petrol resistant paint. I gave the sump a couple of coats of satin black but after leaks and emptying the tank a couple of times the paint has all but been washed off.

Post by **Heuer** » Tue Jun 10, 2014 12:12 pm

POR15: http://www.frost.co.uk/automotive-rust- ... paint.html

ALAN COCHRANE · Post by **ALAN COCHRANE** » Sun Jun 15, 2014 7:41 pm

Well I've had the sump repaired and refitted it yesterday. I checked it again this morning and it was still leaking!
I changed the sealing ring and tried again-still leaking!
I've now used Blue Hylomar on the sump and sealing ring and it now appears to be leak free. We'll see what tomorrow brings.

I returned the replacement sump to SNG after phoning and discussing the problem of it not fitting and being two centimetres shorter than the original. SNG were very helpful and said they needed this feedback for their parts especially rarely ordered ones like the sump.
I'm a bit surprised that SNG don't trial fit all their parts to ensure they actually fit-obviously not done in this case!

Alan

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