The Ender-Thermic pump will pump lava, and only lava, from under itself, automatically loading and unloading chunks as needed. It also causes minimal block updates, and can run off of RF or by players simply right-clicking it. The liquid must be extracted using other mods like EnderIO, Thermal Dynamics, or Extra Utilities.
There's no RF generation included in this mod, either.
50RF per Lava block, one block per right click, 1000mb of lava for each block.
The pump has an internal buffer of 64000mb for fluids, and 3200 RF, meaning that from a full energy buffer the pump can get 64 buckets of lava.
The block does not keep either RF or liquid when broken, both will be lost.
If some bugs happen with where it's checking for lava, for some reason, just right-click it with a diamond and it will reset the block check positions. Depending on how much lava you've pumped, it'll take a while to re-check all the chunks until it gets all the way out.
If you have any other small, simple mods that haven't been updated/aren't planned on being updated, let me know. I want to get some experience modding Minecraft and I'd love to help people get updated versions of mods along the way.