Enabling refuel on map objects
The Nimtech GOM aircraft loadout menu disables refueling for map objects. To change this setting, add the following to the init of your mission:

//TTT_fnc_aircraftLoadout modified for use of vanilla resources

TTT_fnc_aircraftLoadout_NeedsFuelSource = false;
//(default: true) needs fuel supply within 50m of the aircraft or functions will be unavailable

TTT_fnc_aircraftLoadout_NeedsAmmoSource = false;
//(default: true) needs ammo supply within 50m of the aircraft or functions will be unavailable

TTT_fnc_aircraftLoadout_NeedsRepairSource = false;
//(default: true) needs repair supply within 50m of the aircraft or functions will be unavailable

TTT_fnc_removeFuelFromMapObjects = false;
//(default: true) will remove all fuel cargo from map objects like gas stations so players can't land on the roof of a gas station for a maintenance free refill, might affect other parts of your mission so choose carefully
true



For further references, check ttt_nimitzfunctions/fn_loadout/fn_aircraftLoadoutParameters.sqf

WHY this mod breaks vanilla refueling??!!! please disable it.

It's part of the loadout script, you can alter it via the globals in the comment above yours per mission.