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

Need some help, I did a short test run. But can’t get longer than about 50 seconds or so run time, using esbit tablets they don’t seem to be very efficient the water is already boiling when I put it in the boiler and with fresh tablets it boils very nicely producing good steam but after a minute or so the flames die down a bit and seems to stop producing a good flow of steam. Fuel issue + leakage? Or is the leak at the steam whistle enough to cause it not to run. Here is a video of the engine running
                  https://m.youtube.com/shorts/Y9ZeXHiX9Cw