My sons 83 crown vic is not getting gas. It gets gas where the gas line hooks into the throttle body, but for some reason nothing is coming out of the injectors. Was working fine one day and the next nothing.what could be some possible causes that I should be looking at?

Check the OBD error codes for a clue.

Throttle body or carburetor ?

Is this car throttle body injected?

is it getting gass if u got spark to the plug's it should start.dump alittle gas down carb or throttle body making sure to replace air cleaner or snorkle and try and start.if starts could be fuel pump.

Dependent on what year you have. If it has an idle speed motor that could be cleaned as well as the throttle body. Idle speed motor may need to be replaced sometimes a good cleaning hooks them right up.

Idle air control valve. And/or gunked up throttle body, pcv port at throttle where mating to intake manifold.

IF THE PROBLEM IS NOT THE FUEL PUMP, FUEL RELAY, FUEL PRESSURE, AND OR FUSE WAT ELSE COULD B THE PROBLEM

sounds like your PCM might be bad if it is not supplying correct voltage to fuel injector.

Also, the fuel injector itself may be bad or bad ground.

Does it have throttle body injection on that crown vic?

attached to the throttle body,looks like an electric motor bolted to a square piece with the corners notched out,with 2 wire connector on the end.

Ford is notorius for bad breathing.There EGR system is terrible, it always causes a lot of carbon build up in the throttle plates. The best thing to do, is to take of the throttle body assembly and digg out the carbon thats restricting the air flow. Also, it is a good rule or thumb to clean the throttle plate with carb & throttle cleaner with a tooth brush. Add a bottle of fuel injector cleaner to a full tank of gas. While your doing all this you might as well change the EGR valve. If you follow the air intake pipe from the air filter box, it should lead you to the throttle body assembly. The EGR valve is located on the passenger side by the fire wall underneath the heater hoses and AC lines. Good luck, Ford engineers must have been drinking when they designed their vehicles, they don't make anything easy.