The Road Vehicles (Construction and Use) Regulations 1986 s.39 as amended (see link below)
All fuel tanks:
- Shall be constructed and maintained so that the leakage of any liquid from the tank is adequately prevented.
- Shall be constructed and maintained so that the leakage of vapour from the tank is adequately prevented.
- If fitted to a vehicle first used on or after 1st July 1973:
- Made only of metal.
- Fixed in such a position and so maintained as to be reasonably secure from damage.
- A two-wheeled motorcycle (with or without a side-car) first used on or after 1st February 1993 need not have a fuel tank made only of metal.
The Road Vehicles (Construction and Use) (Amendment) (No. 8) Regulations 1992