Did a little online research....Red Rust is only very weakly magnetic as opposed to its cousin Black Rust which is strongly magnetic.  So David is basically right.  Not sure which rust forms in our fuel tanks; pictures I've seen of clogged fuel filters and cut open fuel tanks show mostly red rust.
So the magnet idea might not work.  Oh well.

    On Friday, September 6, 2019, 5:37:51 PM PDT, Richard Koerner <rjkinpb@SBCGLOBAL.NET> wrote:  
 
  Yep, it sure is; that red rust and all; it's Iron, just like those magnificent hills in the Southwest USA.  

OK...need somebody to go out to get some red dirt....with a magnet....and see if anything collects.  I'm sure it will happen.

    On Friday, September 6, 2019, 5:22:03 PM PDT, David Beierl <dbeierl@GMAIL.COM> wrote:  
 
 >
> So, instead of all these rust particles naturally flowing to the outlet,
> they are stuck at the 12 points.  Could buy a lot of time, decades even.

I don't believe ordinary red rust is magnetic...

Yrs,
d

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