The transport of fuel must comply with the rules of the ADR, the European agreement for the transport of dangerous goods by road. However, in certain cases a partial or full exemption from the ADR is possible.
For private individuals, the transport of fuel intended for their own use is exempt from the ADR. The maximum quantity is 240 liters divided into suitable containers of up to 60 liters each.
For companies, the transport of fuel is only exempt from the ADR when the transport is secondary to the business activity. Think of emergency deliveries for maintenance or repair, or for delivery to a construction site. In this case, the maximum quantity is 450 liters per package. However, transportation for internal distribution is not allowed.
Measures shall be taken during transport to prevent any leakage under normal conditions. Therefore always use UN approved jerry cans or barrels with a good closure and make sure that they are properly secured during transport.
Also keep in mind that this is separate from excise duty on the import of fuel from abroad. If you bring more than 10 liters of reserve fuel into the Netherlands, you must pay excise duty to the tax authorities.