[Dalrymple]

"Every car with pump in the tank has filter located in the tank in front of that pump"

In cars that use the older convention, this second "fuel filter" (always in the tank) is technically called a "strainer". My experience is the downstream fuel filter which in older cars is outside the tank needs to be replaced much more often than the strainer which is typically replaced as one unit with the fuel pump. I assume this is because the strainer does less rigorous filtering than the downstream filter which historically has been much easier and cheaper to replace.