Don't know your particular car but this problem is usually caused by an air leak in the fuel system allowing the fuel to drain back to the tank when parked. I would suggest that you park it facing down a steep hill and then look for a fuel leak. Could be round the fuel filter or even the injector leak off pipes. If you fit a section of clear tubing between the filter and pump you can watch for air bubbles. Could even be the primer itself.
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