I have an idea for an easy pump.
1. Use an Autonomous Activator with 8 buckets in it set to right click mode.
2. Attach a item duct to the back of the activator and put a servo in it. Set it to whitelist lava buckets.
3. Teleport the lava back to your base through a Tesseract.
4. put another autonomous activator on the other end and have it right click on a tank.
5.Teleport the buckets back to the nether and feed them back to the activator.
Don't know if this works because I haven't had a chance to test it.
I wish you luck though!! -shiftricity