https://www.mercruiserparts.com/866169t01-pump-kit-fuel

Edit: looks like this a gen 3 pump. Shouldn't the only difference be the electrical connector?

Completely different and won't match up to any of the Cool Fuel 2 connections

First off - thanks for posting this photo as I have to replace my high pressure pump and can barely see the thing...can reach but limited visability.
Second, I ordered a pump on amazon which the Merc Manual says is compatible.- hoping it is the right one.
Third - is the connection to the cool fuel tube just an O-ring?

Yes, the small end just presses in place

Griff, Swamp,

Which connection are you referring to? The fuel output?

Thanks. Brad.

yup. Pump is threaded on one end and not threaded on the other. Pushes into the cool fuel housing and I think it has an O-ring....but wont know until I take mine apart.

Swamp,

Can you post a pic of the new pump you have? Maybe that will shed some light….?

Thanks. Brad.

The end with the wires presses onto a nipple fitting with O rings Fuel Pump and Fuel Cooler