i use the real fuels mod and its not letting me select the fuel for the lm ascent stage engine, it works for every other tank tho
edit: nvm i figured it out, real fuels used up all the space in the ascent stage of the lem for the rcs by default, does anyone perhaps know how much i need? it can hold 375kg of fuel and i dont know how much of that i should allocate for the rcs and the engine itself