For those who don't know, Algae-X is a magnetic device you insert into your
diesel fuel line, between the fuel tank and the primary filter. The diesel
then flows through a strong magnetic field on the way to the primary (in my
case, an everyday Racor). The magnetic field is claimed to "treat" the fuel
in such a way that fuel contamination in the tank cannot take place, so the
resulting problem of sludge--called, generically, "algae"--is eliminated.
(The return line recirculates diesel back to the tank, so the longer you run
your engine the better the quality of the fuel becomes, until you reach some
equilibrium of perfection.)

Yes, it does sound too good to be true, but I've found on line wildly
contradicting stories to the contrary: that it really does work. I also
know as well that things too good to be true usually aren't.

Anyone try one of these gadgets? I have one claim that says they're
standard equipment on Coast Guard boats. I also have a Coast Guard memo
that says they don't work. Etc. etc. etc. Does Cummins ship new engines
with Algae-X units installed as factory equipment? Read on the web they do.
Can't find anything to verify that on the Cummins website. Etc. etc.

I'd LOVE to