328i won't start. Turns over but doesn't fire.

Pump the tank dry of the fuel using the electric fuel pump, just jump the fuel pump relay to get the pump to run and remove the supply line to the injectors and attach a hose. Use extreme caution around gasoline, no sparks, ground the container to the truck.

Most newer cars are very sensitive to being ran low on gas. The fuel pump is in the tank and relies on fuel to cool it down. Your fuel pump is now probably not pumping the required pressure for the fuel injection system to work properly (or at all).

the fuel pump is cooled by gas so if u run it low alot or {OUT} it can burn it up
keep that tank at 1/4 or u will pay!!!

No crank to a mechanic means the starter motor doesn't spin the engine over, is this what you mean? Or do you mean the engine cranks over but will not fire up and run? If it is the latter have you added at least 3 gallons of gas to the tank to make sure the electric fuel pump inside the tank can properly prime? If not do that, also you can spray starting fluid into the engine engine air intake pipe after adding the 3 gallons and see if that gets it going. If it still will not start you have burned up the fuel pump and you will need to drop the fuel tank and replace the pump, remember the pump is cooled and lubricated by the gasoline it runs in, so when you run low on fuel or out you can very quickly severely damage the small electric fuel pump. Never let the gas gauge level go below 1/8 tank to prevent premature fuel pump failure.

It sure could be. But, first...by "won't turn over" you do mean it cranks at normal speed but won't start?
A simple test of the fuel pump is to stand by tank and listen as someone turns key to on. When first turned to on, your pump will activate for 2 or 3 seconds, pressurizing the fuel system, and then shut off if the engine computer doesn't get a cranking signal. Do you hear it come on? If not, then something's not turning your pump on. If you can hear it buzz on briefly, then maybe it's your filter. Another test: Spray a little starting fluid into your intake manifold (remove the big hose going into intake manifold) while someone tries starting it.If it doesn't fire and try to stay running, then it's probably an ignition problem. But if it does fire off, then you know it's a fuel problem-likely your pump or filter. good luck.

If it turns over but does not fire then it is prolly the fuel pump. Running them dry is not healthy especially with the ethenol in todays gas.

sounds like it might be flooded. Try and remove the fuel pump fuse from the fuse block that is just in front of your left knee. While it is out crank the car and see if it wants to start and hold down the gas pedal all the way and then relase it and back and forth and once you get it to run have the fuse ready in your hand and in front of the spot to install it. and then keep the rpm's up with the gas pedal until the smoke clears out behind the car.

Thanks for choosing FixYa and welcome. You probably need to prime the engine. You need to put a little gas into the intake and then try starting it. Check to see if you have a fuel reset button. It may be located in the glove box. If you prime the gas, it should start. You might have to do this a few times before it will catch. If it doesn't, there might be a chance that you have another issue. Make sure you can hear your fuel pump kicking on when you first turn the key. Do this first. Turn the key on for 10 seconds and turn it off for 10 seconds. Do this 5 times and then try to start it. Repeat the process if you have to. This will prime the fuel pump.

If you live in a cold climate your gas line may be frozen or you may have water in your gas adding gas line antifreeze may help.

sounds like to me you picked up trash in bottom of tank. Check fuel filter