With the latest version (1.4.3), quality is preserved on replaced pumps (thank you!), but now instead they seem to be "disconnected" from trains. If you have a molten iron station, for instance, if you use /paint-pipes, the pumps will be properly replaced, with correct color and quality, but they will refuse to connect to the train until you either manually replace them or you /unpaint-pipes.

Oh no :( Thanks for letting me know, I will look into this tonight.

No rush, just figured you wanted to know! Damn pumps are ornery, it appears!

I have unfortunately been unable to replicate this issue. The pumps briefly diconnect from trains, but immediately reconnect to the fluid wagons when painted and unpainted. Could you share a save file or modlist?

I will attempt to nail this down, and will get back to you! (I have my suspicions of the problem, and it's actually likely it isn't the mod, just me being dumb)

Alright, after further testing, it appears to be not caused by this mod specifically. It's instead a strange interaction between "No Pipe Touching 2.0" and the Electric Trains mod. If you use them together, painted pumps will not interact with electric trains, somehow.

So, not your problem :)