Galvanised Fuel tank ? ? ?
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  1. #1
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    fogey is offline

    Galvanised Fuel tank ? ? ?

    What are the pros and cons of making a petrol tank out of galvanised steel? (Aluminium would be nice but don't have such welding facilities and I want to make it myself) Oh, and is 1.2mm thick enough for a tank slung under the boot?
    Last edited by fogey; 01-08-2020 at 11:46.

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  3. #2
    Official RnS Addict 29stude's Avatar
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    Already galvanised?

    I'd go for at least 1.5 for ease of welding. To make something solid but not to heavy 1.6 (16gauge)?

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    Welding galvanised sheet burns off the zinc and expose the carbon steel below. This also results in the burnt zinc deposits being fine enough to block fine filters or contaminate the fuel system. This would also be the case for "zintec" sheet.
    Brazing might reduce this potential but keeping the sheet below the melting point of the zinc and hot enough to melt the brazing rods is extremely difficult.
    You could go proper old school and go for clinched, rivetted or swaged joints to avoid the welding. But that is a task in itself.
    Go with cold rolled or cold reduced carbon steel and coat line it (1.2mm is ok ) or use the aluminium coated steel like the tank manufactures use. This welds up without all the fur and deposits that zinc produces

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  6. #4
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    I bought a new so-called galvanised tank for my MGB, but in reality it appears to be the aluminium coated mild steel referred to by Weldtech, so made because of the difficulties expressed above.

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    i've made a couple of tanks from zintec, 1.2mm. before welding i 'buzz' the coating off the edges and always fit an inline filter where it's easy to get at. keep spare filters in the boot with a screwdriver and you'll be just fine (or use one of the glass tube ones where the ends unscrew to access/clean the plastic element.
    as above i wouldn't use galvanised sheet for a tank.
    neil.
    need a job done on your project? i may be able to help.

  8. #6
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    Thank you - all info much appreciated

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