There most certainly is an issue with fluids leaking between pipelines.

If you can show such an issue and method to reproduce it let us know, everything else is just noise.


I think there are two issues at play here:

1. The EM factory ports are rotationally symmetrical and it rotates in 90 ...

I'm having the same issue with the EM plant. Not sure how I got into the situation, I think my holmium ran out and the EM plant just started spitting out heavy oil from the holmium port for some reason. In the attached save if you place a pipe on the holmium I/O port, it will be filled with heavy ...