If you want to know if fuel is reaching the injectors - take the metal tube from the fuel distributor/pump to any one of the injectors off at the injector. put a small container under it and have someone crank the engine - fuel should spurt out. If it does - continue to remove injectors and check compression. Remember the compression is a lot higher in diesels than gas engines - do not use a pressure guage that goes up to 300 psi - it is not high enough. Get the right guage for this job.