first i would check if the fuel pump is getting power or if the ecu or airbag system deactivated it due to the accident. also make sure the car has gas in it. and if the accident or towing could have caused all the fuel to end up on the drivers side of the tank than the fuel pump would starve... and the siphon that brings fuel from the drivers side to the passenger side where the pump is, is a venturi that is pressurized by the fuel pressure regulator... so no fuel pressure means no transfer so the gauge could say you have up to just below half a tank, but be reading the drivers side only, and the car wont start. this situation would be remedied by just adding a gallon to the tank since it fills on the pump side.
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