Make sure you've enabled the relevant options for this mod, and that you have enough water pumping capacity.

Same issue here. I have the option enabled and it works for water towers but not water pumps.

Turning off "ignore original water buildings" fixed it but the pumps I placed were not on the map originally

Were there pipes or other water infrastructure on the map originally?

No, nothing. I made the map. I should have had the setting off to begin with I guess.

I am noticing a separate water issue. Water from tank reservoirs don't get used? My water pumps caught fire and stopped pumping and my tank reservoirs never distributed water from its full tanks.

Which setting are you using?

"ignore original water buildings" setting was on and prevented my water pumps from distributing water to buildings. I fixed this by turning the setting off.

The issue with the water reservoirs is another issue that is not tied to the above mentioned setting. The tanks are at 100% and do not distribute water when needed.

Do you have the remove need for pipes option enabled?

Yes

Ill take some screenshots

I don't know what changed but the water from the tanks is infact being used. Sorry for wasting time. Everything is working perfect.

Its just a game quirk I think. If I manually turn off my pumps and water towers than the tank is used but if my pumps stop working because of fire then the tank is not used. I don't think this is caused by 81 tiles.

That does indeed sound like a game quirk, yes.