If those BG filters(BG#400 and BG#500 ) have paper elements in them they are rated at 10 micron, not to be used between the pumps and fuel tanks
I did that and found out the hard way those filters only belong between the pump and carb or between the regulator and carb.
EDIT: BTW, I was told by one of the BG employees that their 400 and 500 fuel filter element was the same as the early ford had in their mechanical pumps back in the 1960