How do you remove deasel from vw t25 fuel tank?

To remove diesel from a VW T25 fuel tank, first ensure the vehicle is secure and the fuel system is depressurized. Disconnect the fuel lines and drain the tank using a siphon pump or by removing the tank's drain plug if available. Once the diesel is removed, clean the tank with a suitable solvent to eliminate any residual fuel. Finally, reconnect everything, ensuring all connections are secure before refilling with the correct fuel.