[Fast Corners]

Inverting the pump handle is exactly how I had to fill my 964. My thoughts on the issue were that the shape of the filler neck or the vent size was insufficient to let the gas go down into the tank with out backing up to the nozzle. This phenomenon should have little bearing on the collapsing tank issue though since this seems to be a standard complaint with this series car. The 964's that I saw with the colapsing tank issue had problems with the vent being clogged. It should be noted that the reservoir was updated in 93 with a new unit (96420107704). The next time the car will not start go open the gas cap and see if the tank has developed a vacuum. If it has this will equalize the negative pressure and hopefully allow the car to start.