Author Topic: Aluminium Fuel tank leak.  (Read 400 times)

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A10 JWO

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Aluminium Fuel tank leak.
« on: 06 December, 2020, 13:17:05 »
Just had a leak mig welded on a small seam on an aluminium tank. I have been using POR 15 on steel tanks for years which has never let me down. I read somewhere that it won't work on non steel tanks. I only wanted to apply it to the back of the weld. Has anyone had success with anything else. Thank you.   

chaz

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Re: Aluminium Fuel tank leak.
« Reply #1 on: 06 December, 2020, 13:38:36 »
by the nature of aluminium it has a built in oily surface, we get our billets in that are slippery and when finish machined have to be etched to dry them out before plating or painting can be done. I very much doubt por 15 will seal on ally as with steel tanks you have to do the prep to clean the surface and use the various liquids to get it to stick,  not doing it thoroughly results in peeling.
When My AJS Stormer had an ally tank, my local specialised welder did a good job on the seam but he left it outside for a week with soapy water in before he thought about welding.
so to answer, probably not.
there is a product that is 2 part that will stick to ally but again has to be thoroughly dry but petrol may lift it.
you could try JB Weld but again needs to be keyed   into the surface.

DAVE BRADY

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Re: Aluminium Fuel tank leak.
« Reply #2 on: 06 December, 2020, 13:45:30 »
Hi,

Is this for use on the outside of the tank?  JB Weld is said to work on aluminium and I would think that if this is be used on the outside then definitely as the surface can be properly cleaned and etched.

Dave.
« Last Edit: 06 December, 2020, 13:47:47 by DAVE BRADY »

A10 JWO

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Re: Aluminium Fuel tank leak.
« Reply #3 on: 06 December, 2020, 13:58:24 »
Thanks. It is inside the tank so will not show.

DAVE BRADY

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Re: Aluminium Fuel tank leak.
« Reply #4 on: 06 December, 2020, 14:12:41 »
Hi,

If it was cleaned well enough for the welding then it should be clean enough for JB Weld.  I would imagine that access will be bit tight so good luck with it.  Interestingly the POR 15 info. only says not suitable for plastic or fibreglass but a different 'Metal Prep' may be needed.
It may be worth contacting Frost to see what they say.

Dave.

WayneBergman

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Re: Aluminium Fuel tank leak.
« Reply #5 on: 08 December, 2020, 02:42:36 »
HI A10 JWO, i have tip for you regarding appling an epoxy fill should you decide to go this route. I have had great success with West System Epoxy when it comes to bonding Aluminum to itself or other items. The key is of course the metal has to be super clean so normally I prep with aceatone but the REAL secret to success is  DO NOT SAND for key in BEFORE APPLYING YOUR EPOXY. First clean the surfaces that will be epoxied, then wet out with West System then and only then ruff up the area with an 80 grit paper. The reason for this is if you wet sand the epoxy into the aluminum the epoxy will somewhat limit the oxidation that would normally occur if you sanded before wet out. I have been told that as fast as you can sand a normally dry aluminum surface it will imediattly oxodise enough to stop your epoxy from bonding. The wet sand with the epoxy works like a charm. Not saying its going to look any good but for what its worth it may seal the area.

If any larger voids to fill then use the above treatment but follow up with a thickened epoxy (chopped up fibers ) placed in the void after initial wet out and abrasion. I use the West System 105 with the 206 hardner that gives a 30 minute pot life. Cooling the resin will also thicken it. I hope this helps.........wayne

A10 JWO

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Re: Aluminium Fuel tank leak.
« Reply #6 on: 08 December, 2020, 12:06:57 »
Thanks for that comprehensive reply. Will source and research the product. Regards Colin.

Mike Farmer

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Re: Aluminium Fuel tank leak.
« Reply #7 on: 15 December, 2020, 16:33:22 »
 :) :) :)
There is a specific alli filler strong enough to form a patch in my M20 gearbox. I will find the name shortly and let you know.

Mike 8) 8) 8)

Mike Farmer

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Re: Aluminium Fuel tank leak.
« Reply #8 on: 15 December, 2020, 16:54:15 »
 :) :) :)
Body Alu 8) 8) 8)

A10 JWO

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Re: Aluminium Fuel tank leak.
« Reply #9 on: 16 December, 2020, 21:19:14 »
Thanks lads.

DEAN SOUTHALL

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Re: Aluminium Fuel tank leak.
« Reply #10 on: 17 December, 2020, 12:39:50 »
Might be a bit late but I have  a guy who regularly welds ally petrol tanks tha have developed a leak. No drama, no waiting for weeks.
He's near Nottingham
BSA: turning ordinary men into mechanics since 1910

A10 JWO

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Re: Aluminium Fuel tank leak.
« Reply #11 on: 17 December, 2020, 13:29:31 »
Thanks Dean. Won't be do anything till things start to warm up and calm down. Merry Xmas.