i have been having with my van starting up due to it not sparking have now sorted that my loom wasnt earthed! so now it sparks but still no joy into firing into life

I think the issue with it not firing into life is the injectors are not injecting the fuel pump primed up but doesnt fire up so I can only put it down to injecotrs not delivering the goods

how can I test they are working ?

How can i be sure there connectied to loom correctly?

its an efi engine loom connected and a escort disel van loom