I am lazy and so i keep wanting to just shift click.....everything. Much to my detriment with the whole generator/empty ful can + shiftclick causing my game to die a grim death. However it seems that anytime i failed and made the game crash like that, any and all full fuel cans i had on hand, would become useless. so with any luck and the next update (where the aforementioned shift click bug should be fixed) this should become a none-issue from my point of view.