Yep, that is indeed what it says about the fuel pump. But remember that the filter has FOUR outlets/inlets. Primary is in from pump and out to engine. Secondary are another return to tank and the joker is the outlet from the fuel filter/regulator valve itself - which also connects back o the tank - This is the small port labeled "can". If this valve sticks open it can bleed off pressure to the tank.

I would agree the primary check valve is in the pump.

All that said - no one has identified the metal can in my first photo. What the heck is that thing?

To quit beating a dead horse, I've bitten the proverbial bullet and ordered a Bosch pump from German Auto Parts in Charlotte NC. They are good folks I have dealt with in the past. Their store price is $145. Of course I shouldn't brag on them until I see if this does solve the base problem. Got the Bosch part number from onehundred80's reply - thanks! Still no clue as to why pump would fritz out when filter was changed.

One Plus side of the XFire is that the external pump design makes it much easier to change. of course I also think this is what caused all of my problems - whoever heard of a filter with four lines? Internal tank pumps are simultaneously simpler and more expensive