Do you have a FASS, or running factory? If you have a FASS, call them and get the 2 micron filter. If not, check these guys out http://www.glacierdieselpower.com All their kits are extremely well put together, and the instructions are good too!
Go to Wal-mart, AutoZone, Advance, or a truckstop, and buy Diesel Power Service, in a white jug in the summer, and a gray jug in the winter...I think those are the right color bottles. Read the front to make sure...one should say something like "+ anti gel" or something along those lines!
Those aren't sure fire ways to keep a pump alive, but that is what has been recommended to me, and it's a good plan at least. We have at least 4 trucks in my area doing this!
Chris