Cadillac Repair: car is hard to start after engine is warm, cadillac sedan deville, volume problems

Question
96 Cadillac Sedan Deville having problem starting after engine is warm. I have to pump the gas pedal a couple of times while turning the key to get it to start. My mechanic has check the map censor, fuel pump and the fuel pump pressure regulator, each works fine and he has not found/solve the problem.  

Answer
pumping the accelerator is NOT doing anything but exercising your foot, So do NOT pump the gas pedal as you are only causing more difficulties to enable the car to start.

There are numerous sensors that can cause this problem and to try and list all the possibilities would be useless as I would need to have access to the vehicle.

You FIRST have to positively identify if your problem is ignition to the spark plugs, ignitio to the injectors or fuel pump pressure/volume problems.