Porsche 911Turbo does not start after 3 months of service life

Hello Have my 911 turbo as in all the years before on October 30th shut down and packed clean. Yesterday I wanted to start it as usual once briefly, but it did not jump on anymore. If I turn on the ignition then I hear no gasoline pumps running. The starter rotates the engine as usual. The fuse, as well as the two relays for the fuel pumps 1 & 2 I checked – are fine. Does anyone have any idea how to control the two relays? H Abe there still something forgotten. It is with the vehicle a 911Turbo. Mod. 930 BJ. 1988