I turn my car off and the gas pump stays on and runs the battery down.97 rivera

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The gas pump will stay running and also the 3 min delay to start comes on says security and i have to wait 3 min to start it.I had to put a key on the battery to turn it on and off every time i am not using it.Now it started yesterday the motor shut off going down the road.Can this be anything to do with the speedometer or any ideas?? Thank you..