> I wonder if there's any benefit or or problem if I put another canister
> fuel filter (same as the one downstream) upstream of the fuel pump?

There is not much pressure driving flow of fuel into the pump (it's
easier to blow than to suck...), so the conventional wisdom seems to
be to use a very coarse pre-filter, if anything.  Good write-up here:

https://www.gowesty.com/tech-article-details.php?id=115

FWIW, I've been having some hesitation on acceleration, and after
eliminating most other possibilities, my current best guess is that
it's a fuel supply issue.  Planning on replacing pre- and
post-filters, and my dented fuel tank in the next couple of
months...will report.

Like Neil, I've also experienced contamination due to a failed seal on
my expansion tank.  There is definitely some stuff in my pre-filter I
wouldn't want to go in my pump.

Bonus AAGH! of the day:  Discovered yesterday my CV boots contained a
lot of water, likely from getting stuck in a stream in August.  Trial
by, uh, water, for Red LIne CV-2!

About to dig into my loose steering column,

Alex