I wonder also if this flow issue factors into the filter size debate that
has gone on here an other places. 2 micron filters would reduce the flow
rate and thus the effectiveness of the water separation. In a situation
where you were just barely getting enough water out of the fuel, passing
some particles on the the secondary filter(s) might be important. Also, if
filters are operating close to maximum flow, they won't be able to hold as
much before needing replacement. Secondary filters, which are not also
called on to separate water, would then be the best place to deal with the
finer particles.

In a situation like mine, where water is an insignificant problem, the
smallest filter I can buy is way oversize for the optimum flow rate, and the
secondary is a real bitch to change out, continuing to run 2 micron elements
in the primary makes sense to me.

What do you think, Joe?

--
Roger Long