I hooked my battery up backwards now the ignition won't turn over when I turn the key. It also sounds like its not getting fuel

No. Replace the Engine control unit that was destroyed when you reversed the polarity to it.

Did you check your MAXI-fuses? Make sure you check these, as well.

Check the wiring, as well.

It could be the microcontroller.

Pull the Battery Post off the Battery then the fuse If that don,t work Cut the Horn Wire To It

on a lot of these late model computer base cars when battery power get low the computer gets confused. try this disconnect the neg. battery cable. charge the battery. reconnect and try again. my son cobalt battery went bad key was stuck in the igntion. good luck.

first sounds like the wires to the starter are right,they may be cross or backwards. the other are you sure all the wires are collected. .there is a wire from the fuse box the the starter. I do motor swaps all day in my garage.https://www.facebook.com/TedsRepairs

Clean the carburetor and add a fuel cleaning additive to the tank. That should do it. Your alternator should be fine, but get that checked if the other suggestions don't work.

You don't say what kind of vehicle we are talking about, but it is safe to assume your ignition switch needs to be replaced.

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.

DISCONNECT YOUR BATTERY AND RECONNECT, THIS SHOULD RESET THE BRAIN.

ALSO...WHEN YOU TURN THE KEY, LISTEN TO HEAR IF YOU CAN HEAR THE FUEL PUMP COME ON...IF NOT, GUESS WHAT? HOPEFULLY NOT!... BUT,YOU MAY NEED TO REPLACE THE FUEL PUMP, IF YOU CAN'T HEAR IT WHEN YOU TURN THE KEY, AFTER YOU'VE RESET THE BATTERY!

HOPE THIS HELPS!

When it sounds like it wants to start but won't, it is almost always a fuel problem. When you first turn on the ignition key (radio off, in a quiet setting) do you hear a faint 'hum' from the rear of the car? If so, your fuel pump is probably alright, so the next check it to remove the small, light green plastic cap (it might be black, about the size of a tire valve cap) on the top of the engine-it is part of the fuel rail and has a small pin in the center of it. With a rag in your hand, hold it over the valve, and with the key on, use a small screw driver and push the pin in-the rag will keep you from getting sprayed, if all is alright, but if you get little or nothing, you have a problem with your fuel pump, filter, fuel regulator or you may have a plugged 'sock' at the bottom of the tank.