Guys, I don't understand why you are installing filters AFTER the pumps? I sell large SEPAR diesel fuel filters and I always recommend all the filtering to be done before the pumps and out of the tanks. 
 Any water or debris if it's allowed to reach the pumps, will be beaten into smaller particles and may be PUSHED thru the filter, or even will damage the pumps. 
I personally suffered on my boat by frequent engine stopages in the worst of times, only to discover that the manufacturer have installed a screen on the pick up tube inside of the tank, where can not be seen or cleaned. 
The same manufacturer had to fix or replace number of engines only because he installed the fuel pumps BEFORE the filter. Any water in the fuel was beaten in to fine emulsion and pushed thru the filter into the injectors. Results were rusted injectors, rusted high pressure pumps and more. 
Buly