Chuck
Are you sure you are getting a vacuum in the tank?
I ask that because my tank is always at a small positive pressure - when I take off the cap at the gas station - pressure escapes.
I am convinced (well 99.9%) that having a pressure in the tank is the normal condition.
I realise we are on different vehicles here 123 v 124 but I would not have though fuel system would be that different.
From my owners manual page 164
Quote:
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Prior to refuelling, turn filler cap to left and hold in position to allow excess pressure to be released.
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Hope this is helpful.