Rooftop diesel storage

[Brissieboy]

Just looking at options to carry some extra fuel on the roof rack - planning a Simpson trip later this year. Has anyone used this type of plastic 20 litre containers? Supposedly good for diesel. I want something that lays down rather than a normal jerry can that needs to stand up (and I will have one of those down below as well). Do they seal well? Sturdy enough?
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[mudski]

You'd wanna trust the cap to not leak.

[Brissieboy]

You'd wanna trust the cap to not leak.

That is why I asked - I don't really trust what any ad says. I want to be able to lie it down flat. Water jerries often leak there but I have repaired a few of them by simply smoothing up the spout surface that seals against the O-ring in the cap. They are usually just as they come out of the mold and quite rough, but easy enough to fix.

[10G]

I've carried 3 x normal 20 litre jerries on the roof sitting on their side with the breather down several times and never once had a problem.

Don't over fill them, just remember they will expand so take that into account when filling them. I have the Scepter brand jerries which are way better than most other plastic jerries IMO.

I've popped up and undone the filler on them a few times during trips, just use common sense.

A 20 litre jerry weighs about 20 KGs.

[mudski]

Another thing. You'd want to have that strapped down tight, any movement, even slight will be wearing away at the plastic.

[10G]

Yep, or have them confined so they can move, but not jump out of their confinement.

I built a cage that bolted to my roof rack and locked via padlocks and the jerries sat in that.

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Yes, the rack looks bent, that's how it was delivered. It's not as bad as it looks when seen in real life.

You may notice a stretchy cord across the top??? That's to keep them down when empty, they fly everywhere when empty.

[BrazilianY60]

That is a cool picture 10G.

[10G]

Thanks.
Don't store fuel on the roof anymore. Keep 2 jerries inside now. No, they don't smell.

[Brissieboy]

Thanks.
Don't store fuel on the roof anymore. Keep 2 jerries inside now. No, they don't smell.

I believe that is legal for diesel but not petrol. I also have an arrangement that securely holds 2 jerries inside, but looking at an extra one for the Simpson. I don't mind if a bit of water leaks up top, but not too happy if the diesel does.
And I appreciate all the comments, thank you @mudski @10G!!

[10G]

it's only illegal if you get caught.

i wouldn't carry petrol inside anyway it's too bloody dangerous, diesel is nowhere near as dangerous.