Self-contained fueling station

A self-contained fueling station for fueling an external fuel tank configured to expand axially, said fueling station comprising:

• an internal fuel tank configured to hold liquid fuel;
• a fuel line for transferring liquid fuel to and from the external tank to extend and retract the external fuel tank;
• a bi-directional storage valve;
• a fuel expansion accumulator inside the internal fuel tank configured to maintain a storage pressure within the retracted external fuel tank when the bi-directional storage valve is open in a stored state;
• a bi-directional pump configured to transfer liquid fuel between the internal tank and the external tank to extend the external fuel tank;
• and
• unidirectional deploy and stow relief valves connected in opposing flow directions between the internal fuel tank and the flow line,
• in a fuel-transfer state, said bi-directional pump transfers liquid fuel to the external tank, said deploy relief valve configured to relieve pressure in the external tank and turn off the bi-directional pump when the external tank is fully extended and pressure in the external tank exceeds an operational pressure,
• in a stow state, said bi-directional pump transfers liquid fuel to the internal tank to retract the external tank, said stow relieve valve configured to relieve pressure in the internal tank, turn off the bi-directional pump and open the bi-directional storage valve when pressure in the internal tank reaches the storage pressure to return to the stored state.