I looked arround at variuos plans and I ended up using a float valve, kinda like the one in the toilet tank. I got an aquarium safe one from Kent:
http://www.drsfostersmith.com/produc...;N=0&Nty=1

I then got a small container (2G jug from Target) and placed it on top of the sump and connected it to the float valve. Whenever the water level dropped in the sump, the float valve opened and gravity did the work of bringing the water to the sump. I like this method because it has not electrical parts and it does not require suction of vaccume to work. You can see my setup at:
https://webspace.utexas.edu/eleyan/tank/equip_page.html