Hello,
I have update my Buildcraft to 7.0.13 today and i found a bug with fluid :
The water get blocked in the pipe...
I made a video to explain :
https://www.youtube.com/watch?v=w1lUNLoVpP0

As you can see the water still blocked even i restart the world...
Am i the only person with this bug ?
PS: this bug is with all fluid and all Waterproof Pipes
PS 2: I have other mods and my forge version is 10.13.4.1448
My mods file

Break the pipes and place them back down. That solved it for me. I don't know the cause of the issue.

It work but this is a temporary solution : 2 minutes later this bug reappear...