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KiwiNCFC



Member Since: 14 Jul 2019
Location: East anglia
Posts: 46

United Kingdom 1997 Defender 90 300 Tdi HT Arles Blue
Rustproofing fuel tank
So I've bought a new fuel tank for my 90 as the MOT is coming up and my old tank is leaking.

I plan on giving it a coat of red oxide primer and then some stonechip. I do not plan on going overboard with it and If by painting it first I get another year or two out of it that would be great!

What do you guys suggest I do about the gap between the tank and the outer skin. As far as I'm aware this is how they rust with moisture getting trapped in between and I was thinking of sealing the edges with black silicone sealant but as it's not that strong I worry if the seal breaks and mositure gets in and I make things worse.

Thanks!

Click image to enlarge
Post #857927 24th Sep 2020 5:43pm
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Bluest



Member Since: 23 Apr 2016
Location: Lancashire
Posts: 4205

United Kingdom 2007 Defender 110 Puma 2.4 XS CSW Java Black
I wouldn’t bother with paint on that, as none of it will get to where it’s needed anyway. I would use Dinitrol ML to get in all the bits you can’t access in the crevices. Once that’s had chance to do its thing creeping in for day or two, go over the whole whole lot with Dinitrol 4941 to give a nice black finish. 2007 110 TDCi Station Wagon XS
Post #857931 24th Sep 2020 6:09pm
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Litch



Member Since: 10 Mar 2013
Location: Oxfordshire
Posts: 761

England 
Did my new tank earlier in the year when I fitting the new chassis.

The paint on new tanks is not very good, pretty thin where you can see it and non-existent where you can't.
I keyed the new tank and after de-greasing ran some etch primer into the void between the tank & shield. After that I gave it a couple of coats of Frosts Chassis Black Extreme (Satin) and finally gave it a good coating of Waxoyl making sure that it ran through the void by constantly rotating the tank and feeding in more Waxoyl (needless to say this was done on a nice warm day when the Waxoyl was flowing freely).
The heat used to make the Waxoyl flow freely will not happen when the tank is in use as it is shielded by the bodywork and the fuel acts as a massive heatsink.

I did a similar thing to the original tank back in 1999, the MOD had fitted a new (genuine) tank prior to release and seeing that the paint was not up to much I treated it in the same way with paint & Waxoyl but in those days I used Smoothrite.
On removing the tank this year I could see that it was still in remarkable condition and would probably have been good for another 10+years but I replaced it anyway. ONE LIFE, GET IT!
Post #857965 24th Sep 2020 8:03pm
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Mdm



Member Since: 11 Sep 2013
Location: Sunny Lancashire
Posts: 1591

United Kingdom 
the paint on the the tank inst really paint more of a coating to stop it rusting before its sold. rub it back paint it better.

then we wax proof everything and add some under seal or stone chip on the front edge were all the muck hits.

don't both sealing the edge sup as muck will get in . we run a hose up there now and again and re wax it most years
Post #858067 25th Sep 2020 11:42am
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 8008

 2011 Defender 110 Puma 2.4 USW Stornoway Grey
we had a tank supplied the other day on a rechassis build, it had 3 holes in it from new! not including the ones that should be there. lesson learnt supply your own tank and look inside before fitting! Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop
Post #858088 25th Sep 2020 2:35pm
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Mossberg



Member Since: 29 Feb 2020
Location: Lancs
Posts: 553

United Kingdom 1993 Defender 90 300 Tdi HT Aintree Green
Does no one do an aluminium tank?
Post #858130 25th Sep 2020 6:08pm
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jfh



Member Since: 08 Jan 2014
Location: West Coast
Posts: 357

South Africa 2007 Defender 110 300 Tdi SW Chawton White
Do you have any friends in the aircraft industry?

We use something that's like syrup that you put inside the tank, preferably with a brush, but you can roll the tank in all axis.
This gives a excellent coating that protects the inside from corrosion.

On the outside I'll just give it a nice paint job.
Post #858288 26th Sep 2020 6:07pm
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KiwiNCFC



Member Since: 14 Jul 2019
Location: East anglia
Posts: 46

United Kingdom 1997 Defender 90 300 Tdi HT Arles Blue
Thanks guys. Gonna give it a coat of paint and try and dinitrol between the layers. If it last a little bit longer than it will be worth it!

That inside tank sealer does seem quite a good idea, I shone a touch into the tank and couldn't see any holes so fingers crossed it will be all ok. Think it's a allmakes4x4 brand.
Post #858437 27th Sep 2020 6:00pm
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Blackhat90



Member Since: 31 Dec 2016
Location: Forfar
Posts: 86

Scotland 1995 Defender 90 300 Tdi HT Epsom Green
its the Seam where they"re pressed together that mostly leak , am on my 3 rd tank, all have leaked at the seam,,not rust,,
Post #859438 2nd Oct 2020 9:00pm
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