my 94 q45 won't start.

Have you checked for spark? You need spark and fuel injection into the cylinders (not just fuel in the tank) to have the engine running so you must be missing something there or it would run. You could have ignition problems, fuel delivery problems or cam timing problems, any of which could keep the engine from running. Find a Nissan or Infiniti specialist to help you. Here's a directory link for you: http://repairpal.com/infiniti-repair-in-washington-district-of-columbia