Soldering pinhole in petrol tank

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alan.moore
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Soldering pinhole in petrol tank

Postby alan.moore » Fri Jan 18, 2019 1:09 pm

I have a pinhole on the bottom seam edge of my WNG petrol tank which I want to fix. It looks as though the seams on the tank are welded (gas?) but I just wanted to check that was the case ( i.e that they were not soldered) before I attempt a repair.

I have a low powered MIG which I have used to repair holes in thin metal before (mudguards) so I think a small spot of weld will fill the hole without burning through. The metal of the tank appears pretty thick. I have considered soft solder but the hole is so small I am not confident I will get a decent bond / thickness of solder.

The rest of the seams appear OK, although there is a fair amount of pock marking caused by rust. I am considering either lead filling those pockmarks or using something like JB Weld . Any advice would be welcome.

The inside of the tank is fairly rust free and once I am confident it is leak free I intend to seal the inside of the tank.

SDC11994.JPG


SDC11995.JPG


Cheers
Alan
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simon.holyfield
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Re: Soldering pinhole in petrol tank

Postby simon.holyfield » Fri Jan 18, 2019 1:17 pm

This might be an option Alan, depending on what you are doing with paint:

http://ariel-square-four.blogspot.com/s ... %20All?m=0

It's still happily sealing my W/NG tank. I used it because at the time I didn't want to disturb the paint. It's been fine ever since, but if/when I repaint the tank (it has a blister near the filler) I will weld the holes up.
cheers

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Re: Soldering pinhole in petrol tank

Postby john.mitchell » Fri Jan 18, 2019 2:10 pm

We had an article many years ago about using a dental filling a bit like wire to repair pinholes I am not at home so cannot search my old Chevals. Anyone remember it?
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Re: Soldering pinhole in petrol tank

Postby admin » Fri Jan 18, 2019 3:26 pm

I had similar.
I opted for a POR15 tank liner, which did the job.
I just used it again on a tank, which I received painted, but the paint was lifting where the tank rubber screw holes had been inadequately sealed. it seems to have solved that as well (but time will tell)

It's not cheap, if you include the bottle of cleaner and "metal ready/primer".
It's also not a fast job, the tank needs endless "washes" plus drying.
However, out of all the liners I have tried it's been about the best ....
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paul.jameson
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Re: Soldering pinhole in petrol tank

Postby paul.jameson » Fri Jan 18, 2019 7:45 pm

Having had quite a number of Ariel tanks repaired over the years I can confirm that they are welded, not soldered like certain rough inferior makes.
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Re: Soldering pinhole in petrol tank

Postby john.whiting » Sat Jan 19, 2019 5:09 am

That pitting would be an ideal spot for sprayed on leaded body filler..............which is almost certainly illegal in the EU................Ive heard ordinary 50/50 and 60/40 solders are also restricted ,and not supposed to be on public sale.............the lead free solder is 99% tin,so it probably flows too readily to be used as filler.,as well as being expensive.

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Re: Soldering pinhole in petrol tank

Postby john.whiting » Sat Jan 19, 2019 5:12 am

Speaking of inferior makes with soldered tanks,one such inferior make tried cast aluminium tanks,and that was a disaster with every one developing porosity in short order.

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Re: Soldering pinhole in petrol tank

Postby johnwalsh » Sat Jan 19, 2019 2:10 pm

I understood that tanks were normally soldered in olden times, not necessarily inferior makes. And, that welding a fuel tanks can be explosive.
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alan.moore
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Re: Soldering pinhole in petrol tank

Postby alan.moore » Sat Jan 19, 2019 6:00 pm

Thanks for the replies chaps.
I took the bull by the horns and MIG welded it (tank had been fully cleaned out with hot caustic cleaner and has not had any petrol in it for a few months) . Worked a treat. Put some paint thinners in the tank and no trace of a weep. Covered the rest of the tank with talcum powder and have been testing all the other seems etc and no sign of any more leaks so job done.

SDC12001.JPG


I have used the 'SLOSH' brand tank sealer in the past and am happy with it so will be doing the WNG tank with it. Apparently tested on upto 85% ethanol petrol. It's one part and reacts with the moisture in the air to cure (takes about a week to fully cure) . The pic below of the inside of the tank is from the VH.

SDC12007.JPG
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Re: Soldering pinhole in petrol tank

Postby john.whiting » Sat Jan 19, 2019 11:57 pm

Actually,one "inferior make" with a soldered tank was Brough Superior.....Indian too........however I suspect Paul is alluding to Norton and the famous piecrust seam tank.................


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