update with additional information

so today the cam sensor turned up so I replaced it .
cranking over with the injection rail out I noticed 4 damp patches on the rocker cover.
so I re checked the fuel rail pressure and can confirm 3BAR at crank is present
I can feel the injectors clicking a little as I crank and see a ever so slight mist but not enough .
is it likely ass 4 injectors are at fault ?
is it likely the ecu is sending out a really weak signal to the injectors

just to go over the things I do know
the 3 earths to the ECU are good
The lives to the ecu are good
I keep hearing to check the engine earths . I can confirm I have a bloody great jump lead also to the engine so earths are very good
also the injectors have a permanent 12v live , the negative is switched , as they are plastic housed injectors the earths to the engine cant effect the injectors firing


HELP ME PLEASE
ha ha