A system for the transfer of fluid in a vehicle includes a main tank (4), a secondary tank (5), a pump (6), a first valve arrangement (11) and a several fluid pathways (13, 15, 17). In response to a control signal, the system is placed into a first condition, in which the first valve arrangement (11) is in a first condition, in which the pump (6) transfers the fluid from the secondary tank (5) to the main tank (4) through the valve arrangement (11), or into a second condition, in which the first valve arrangement (11) is in a second condition and the fluid pathways are blown clean from fluid. Also, a method for transfer of fluid in a system intended for a vehicle is disclosed.