I never have any problem "packing in" fuel (gasoline) into the tank of any of my cars for decades. For the last several years, I have been buying gasoline by the 30-gallon increment, thus most of my cars are filled using containers and each one, including the Z, is slowly filled to the brim until the fuel level does not come down anymore. Never a fuel-related problem.
Back to the problem mentioned in the original post. All I could come up with was water contamination. Fuel pump pickup is in the bottom of the tank, so the water must have been introduced or carried by the fresh load of fuel. There is also a possibility in a difference in the properties of the fresh fuel compared to the previous batch. Without a proper monitoring equipment while it was happening, it's difficult to pinpoint the culprit.
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