Method for controlling a fuel tank arrangement

A fuel tank arrangement for a vehicle, the fuel tank arrangement comprising a first and a second fuel tank connectable to a prime mover of the vehicle, a first fuel conduit connectable between the first fuel tank and the prime mover, wherein the first fuel conduit comprises a first fuel pump;

• a first return conduit connectable between prime mover and the first fuel tank, wherein the first return conduit comprises a first return valve;
• and a control unit connected to the first fuel pump and the first return valve, wherein the control unit is configured to:
• receive a signal indicative of an upcoming maintenance event for the first fuel tank;
• determine a fuel level within the first fuel tank;
• determine a minimum allowable fuel level within the first fuel tank;
• if the fuel level in the first fuel tank is above the minimum allowable fuel level:
• control the first fuel pump to deliver fuel from the first fuel tank to the prime mover;
• and
• control the return valve to be positioned in a closed state for preventing return flow from the prime mover to the first fuel tank.

For a fuel tank arrangement connected to a prime mover for propulsion of a vehicle, wherein the fuel tank arrangement comprises a first and a second fuel tank, the first and second fuel tanks being connected to the prime mover of the vehicle for delivery of fuel to the prime mover and for receiving return flow from the prime mover, a non-transitory computer-readable storage medium comprising a computer program product including instructions to cause at least one processor to:

• receive a signal indicative of an upcoming maintenance event for the first fuel tank;
• determine a minimum allowable fuel level within the first fuel tank;
• if a fuel level in the first fuel tank is above the minimum allowable fuel level:
• control at least the first fuel tank to deliver fuel to the prime mover;
• and
• control the fuel tank arrangement to prevent the return flow from the prime mover to the first fuel tank;
• and
• if the fuel level in the first fuel tank is below the minimum allowable fuel level:
• control the fuel tank arrangement to allow the return flow from the prime mover to the first fuel tank until the fuel level in the first fuel tank exceeds the minimum allowable fuel level.