Car was low on gas now it will not start?

If the vehicle actually ran out of fuel, the fuel lines could be dry and need priming (common for carburated vehicles with mechanical/vacuum fuel pumps)This is not usually a problem with electric fuel pumps, but some electric fuel pumps may become damaged by running dry or shut themselves down to prevent damage. Running low on fuel sometimes allows water, dirt or debris in the fuel tank to plug either the fuel line or the fuel filter. Often, one of the cheapest and easiest solutions is to replace the fuel filter. Even if it isn't the problem, it won't harm your engine, and may benefit it later.