While I agree with everything posted above, and I have seen many installations of the standard-style bowl-type fuel-filters and after-market in-line fuel-filters that work fine between the fuel tank and the fuel pump, I had problems with a standard-style bowl-type fuel-filter and then an after-market in-line fuel-filter between the fuel tank and the fuel pump. It was suggested to me to move the filter to the output side of the pump. This suggestion came from a dual-carburetor supplier - the reason was that supposedly there is a marginally stronger pressure side of the fuel pump, in comparison to the vacuum side of the fuel pump (an accomplished in-line-6 engine-rebuilder concurred with this suggestion).
I am not interested in an argument about this, I am only posting what I was told, and what worked for me (problem solved - after trying three different, new, fuel pumps). This may not be necessary in most applications, but, if you seem to be fuel-starved after putting a fuel-filter between tank and pump, maybe this will solve your problem.
