Order of Devices in the Fuel Line

[campbdon]

Hi everyone! I've been really poring over the really helpful articles and discussions on this site. Working through starting up issues at the moment.

My current setup on the fuel side is Fuel tank -> Shutoff switch -> Fuel Hose (1/4" ID) -> Facet Elect Fuel Pump -> Inline automotive filter (seems like quite coarse) -> Carb.

I am considering adding a polishing inline filter, and do understand that coarser grade filtering must precede finer, so which do you suggest as the preferred option:
a) Insert the polishing filter between the carb and current filter, or
b) Move the existing filter to before the pump and install polishing filter where original was (between pump and carb)

Seems to me (b) would help keep any larger debris from reaching the pump, etc. Should , let's say, a 5-micron coarseness be sufficient? The existing one must be well over 10. Or instead, adding a fuel/water separator (eg: Racor) but don't yet have any suspicion of water in the fuel.

Thanks for any advice,
DonC