So to finish this. Fixed version of original script (bug was that exitWith returned nil): _nul = this spawn { waitUntil { if !(alive _this) exitWith {true}; if (fuel _this < 0.25) then { _this setFuel 1 }; sleep 60; false } }; Other possible variant: _nul = this spawn {while {alive _this} do {_this setFuel 1; sleep 60;};}; Probably the best variant:  
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