Hello, today I had the opportunity to test an internal combustion pump with an engine from the brush cutter for grass.
Unfortunately, in my case, where I need to draw water from a well where the water level is below 2.5 m from the ground, the pump did not work. The river test was much better, but the draw time was quite long.
See also the pump I built myself:    • DIY How to make pump motor gas Motopo...  

You can buy a combustion pump here: https://amzn.to/3KShj0x

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