I have the same problem with my two Grand Marquises. As far as I can tell,
the vapor recovery crap on the dispensing nozzle is nonfunctional and
the vapors in the tank and filler tube are being compressed by the
incoming gasoline rather than being removed by the vapor recovery crap.
Considering that as a result all the vapors are being released into
the atmosphere anyway, I have no problem putting the nozzle only half
way into the filler tube so the rubber boot doesn't seal against the
filler tube neck; that prevents the vapor pressure from setting off
the check valve mechanism and lets the tank fill, while the check valve
can work just fine when the pressure actually rises because the tank
is full.

Now, that oughta start the argument of the century. :)