Actually, you don't need a transformer. 32 EU/t is LV and 20 is below it.
And if you get later in the game, I'd suggest using a logistics pipe-enderchest system to collect lava cells from the nether and use it on your geothermals.
You're just kinda doing it wrong. Both pipes have to be the same frequency and the one that's pumping oil out needs to be on Recieve: false and the other one true.
I think the problem is that some items work when he pumps the items in, and the others only work when he placec the items in himself. I don't know what the problem is, because I've never used the MkII before, though.
Can't see it, but are you outputting from the red side of the batbox? Everything else should be good with the setup.
Oh and macerators, batboxes and all the stuff with wires is IndustrialCraft2, the pipe stuff is Buildcraft. ;)