Does any know what kind of pump "Colossus" used for saving the Notre Dame Cathedral?

This is not a definitve answer, but since I went to the trouble to look it up I thought i might as well post what I found: Pretty sure there's no onboard pump

As you can see this is a normal firehose, not a suction hose with reinforcing spirals. this is relevant because it means water has to be supplied to Colossus at pressure, from a fire engine with a pump.

Next, let's look at the published specs - no mention of a pump or water tank:

6 batteries, 48V and 27 Ah translates to roughly 7.7 kWh. Smallest fire pumps I found where around 20 kW - I don't think it makes sense to power a fire pump from a battery.

Water has to be supplied anyway, so at most Colossus would carry a small booster pump. I sum I think the best approach for Colossus and similar vehicles is simply to have a water supply at sufficient pressure, and not carry an onboard tank or pump.