Hello,
I have a problem with Mekanism mechanical pipes and Tinkers Construct seared tanks. I have connected a TE tank and a mechanical pipe to a TC seared tank. The lava in the TE tank does flow into the pipe, but the pipe isn't transporting that to the TC seared tank.
Here is a screenshot:

Michael (aka BakermanLP)

Oh, forgot to say, I tried to configure the pipe with Push and Pull, but that also doesn't seem to work.

i know its most likely a bug but for the meantime if its not a modpack you can add buildcraft (which might work havent checked it out myself)

This is about to get fixed.

Yep, got it fixed on Tinkers' side.