Here's what's bothering me Rob. There are two sides to this filter. You can look at yours. The feed side is completely bypassed by the Fass.

The fuel enters in the top back, goes into the filter chamber and out the bottom of the filter housing to the CP3. The return passes through the filter and is fed from 3 points. I'll get you a pic in a bit. 1 return comes from the CP3, the 2nd comes from the blow off valve on the rail, and the third is the return from the injectors off the back of the head. The fuel is not supposed to go in the filter chamber from the return.

Today I drained the filter housing, removed the filter cartridge and put a new top on. 5 minutes later the chamber was full of fuel and the top popped off again.

I'm thinking the return got a piece of crap in it and the fass is so powerful it broke the filter housing. I'll know tomorrow when I take it out and inspect it and check the lines for flow.