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Swirl's Harris


Swirl

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12 minutes ago, 370steve said:

Remove any paint/primer from around the tank edge under the filler,for around 10mm, leave it bare metal, the problem with paint between the two surfaces is that it "wickes" the fuel.

i use a Viton rubber gasket to seal it.

There was no paint even near the bolt holes. Maybe I over tightened it as the Cork had squished out a bit as well. 

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Does the paint go all the way up to the edge of the hole in the tank or is there a ring of bare metal? In my experience you need a ring of bare metal to seal on for these sort of filler caps. I have recently had problems with hylomar for the same application (Shaw filler) so maybe Hylo is different to what it used to be. In the end I have used a gasket cut out of 'normal' 0.8mm thick gasket material with 3-bond instead of Hylo and 3-bond on the srcew threads too. I try and avoid using 3 bond as it's so difficult to remove but I haven't had any leaks since. Do you have a threaded backing ring in the tank? This also helps.

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20 minutes ago, Dezza said:

Does the paint go all the way up to the edge of the hole in the tank or is there a ring of bare metal? In my experience you need a ring of bare metal to seal on for these sort of filler caps. I have recently had problems with hylomar for the same application (Shaw filler) so maybe Hylo is different to what it used to be. In the end I have used a gasket cut out of 'normal' 0.8mm thick gasket material with 3-bond instead of Hylo and 3-bond on the srcew threads too. I try and avoid using 3 bond as it's so difficult to remove but I haven't had any leaks since. Do you have a threaded backing ring in the tank? This also helps.

Origanal fitting. IMG_20210228_141033.thumb.jpg.3e706b8432cb85b1250b304642996dd4.jpg IMG_20210228_142332.thumb.jpg.5b024b824919382de63b5a384456bd74.jpg todayIMG_20210926_163416.thumb.jpg.5fcea910da7f01394601b1cdf7ada17f.jpgIMG_20210926_163520.thumb.jpg.dfd2b368bbd200e954b63c405101d952.jpg

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