Is there a chunk boundary passing between the barrels and the generators?
I'm asking as i'we had massive issues with pipes and cables bugging out because of chunkloading being limited by the forge chunkloading ticket system. More specific, chunkloading being limited to max 25 chunks unless changed in forgeChunkLoading.cfg.

Block update fixed it

kinda not really. had to break and replace the pipes to get liquid to flow

Please check to see if this is happening in 3.3.

I've got the exact same issue. I've upgraded to 3.3, and after a bit I saw all those pipes reverting to their wrong state right in front of my eyes. Unfortunately the update hasn't fixed this. All the pipes became unconnected, and the servo(s) on them disappeared.

I noticed the same thing with servos. I've lost so many of them now lol

Same issue on 3.3. If you place a torch next to the broken pipes they update and reconnect.

Yeah, if you place a block next to the disconnected pipes, they'll all reconnect. Even when they weren't supposed to (because you seperated them with a wrench before). The servos are still lost.

Okay, it's been 3 days since I changed a setting that solved this issue for me.
In forgeChunkLoading.cfg have the line: I:dormantChunkCacheSize=0
The default in ATM3 seems to be 50, setting the value to 0 has solved my issues. So far so good.

@Trinsec Giving this a try now. Updating my server with those settings.

After 16 hours of playtime on my server no one has experienced this issue again after changing the forgeChunkLoading.cfg have the line: I:dormantChunkCacheSize=0.

We have this changed in the next update going out tonight/tomorrow. If anyone get's this problem on 4.0+ please reopen.