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