The Chunk should not “always be loaded” due to the Spring, if that is the case then that would be a Bug. Are you SURE it is loaded?
As for that Pipe, if it is a normal Pipe there might be leftovers inside the Pipe that keep flowing slowly.
No there is not a way to place GT6 Fluids. Except maybe the Buildcraft Floodgate, I had to implement something to prevent it from doing Ocean Water and the likes, but I did not prevent Oil, so it should work.
And Batboxes exist for the sake of existing. Not to mention I recently, and by that I mean “I still didnt release that Version, because I’m too busy with playing Stellaris” add something that at least emits IV in a Batbox.