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

Nice work on the pump, Doug.
Have a look here, my pump is an older version and the engine is a very old No 7 with a disc flywheel for speed but should give you ideas an food for thought.

https://www.officeofsteamforum.com/collections-pictures/stuart-engine-and-water-pump/msg20153/#msg20153

It really does pump well! I think i will try a belt drive set-up with an early stuart #4 I have. Will have to find a suitable tank. Thanks for the link to your video.
crazydoug