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Hi BC,
The vapor line from the tank to the charcoal cannister can be filled with gasoline if the tank is overfilled. When the cannister is full of raw gasoline instead of vapors, it can no longer function as it is supposed to, and the valve to the vacuum line becomes coated with varnish from the gasoline.
Just don't fill up these modern vehicles past the first click at the pump, unless the pump is defective :) It would be better for miles per tank to moniter tire pressure every time you tank up. Get your wife one of those digital ones, and make sure YOU use it.
Have fun,
Klaus
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1975 164 w/174,800mi (Sold) 1995 850T w/91,000mi, 1998 V70R w/129,000mi
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