Most pulse pumps are not very good at pulling fuel from long distances (floorpan) or uphill. Putting more restriction in the line just makes things worse. These pumps are designed for pushing fuel.
With that said, the Briggs L206 rules prohibit using a filter between the pump and the carb (safety/liability reasons.)
My preference would be to place the fuel filter right before the carb, but keep in mind that most of the fuel filters we are using in karting are pressed together plastic jobbies made in China. They DO occasionally come apart and if placed after the pump can have fuel spraying right on your hot exhaust.
We generally mount them down low in front of the engine in-line between the tank and the pump.
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Thanks and God bless,
Brian Carlson
Carlson Racing Engines
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32 years of service to the karting industry ~ 1Cor 9:24
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bcarlson@CarlsonMotorsports.com