Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Ben , I have had that exact engine , for me (& I suspect most us) its a bit of trail & hopefully no error. I just filled the boiler to the correct (same) amount everytime ,and run it for a period of time and shut it down and see how much water you have left , then if its an ample amount ,you can go a bit longer each consecutive run until you reach what you consider a relatively safe water reserve.