3 injectors,,,tmd20 diesel,,,the pump shop is only charging me 10 per inj to test and i already have out so to make sure,,,,then im going to see if any way i can hookup a pressure tester off pumps lines to injectors to test pumps output,,,i removed glass ckball in return already,,,it has a elec fuel transfer pump and fuel comes thru filter good,,,see no air bubbles in top of glass filter..The chances of all 4 injectors being bad at once are astronomical. I would suspect the pump.
Are you sure that you are getting a good supply of fuel to the pump?
Cheers - SR