Continued fueling after the automatic pump shutoff can force fuel into
the vapor control system. That, in turn, can prevent the vapor
control system from working properly, and cause the ECM to illuminate
the check engine lamp.
> On Feb 23, 3:24 pm, "Edwin Pawlowski"
> > >> All cars say that now. It has to do with the emissions
> system. You need
> > >> some airspace in the tank for the recirculation system to
> work properly.
> > >> .
> > > So you agree that you shouldn't top up?
> > Right. The few extra ounces you get in the tank may cause
> the check engine
> > light to come on if nothing else. I've had that happen with
> my Buick.
> > While it did not cause a mechanical problem, it was an
> un-needed annoyance.
> > Sometimes the engineers know what they are talking about.
> HOLY CRAP! Maybe that's why my Check Engine light comes on
> all the
> time after refuelling!
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