Is filling up with a jerrycan at a petrol station ok?

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Somebody told me they don't let people do it anymore..

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HustleRussell said:

There are rules. Can has to be approved for petrol. IIRC maximum Jerry can size is 10L even though everyone uses 20L ones. Think there's a limit to how many cans you can fill too.

Most petrol stations ignore the rules though and I've never had anybody stop me filling three ancient 20L jerry cans.

Thanks.