...took the '90 with the fuel system problem to the dealer (where my guru
now works).  He appears to have found the problem and fixed it.  Replaced
the "gravity vent" (or is it "valve"?) on each of the expansion tanks.
$28 for parts, $177 for labor.  (Ouch! Still - it's cheaper than another
new fuel tank.)  It wasn't the charcoal cannister or the vacuum valve (as
I would have guessed).

bcnu - Grungy
grungy@mindless.com  (Houston, TX)