Did the diags give the fuel pressures low/high?
HP regulator is a know common issue, ask me how I know.

EDIT: I don't remember seeing any fault codes.
 
If its cranking over, there's only a couple of things it can be.

It's briefly firing on cold start being sprayed it, means no fuel.

Immobiliser has been bypassed and it's cranking so not likely ews at this point.

This pretty much leaves fuel pressure sensor on the fuel filter, should kick up a code but live data will show if this is working.
Camshaft sensor, will kick up a code.
Crankshaft sensor, won't kick up a code.
Injector leak off would have to be very bad not to start, should still start but be very rough.
Theres also a pressure sensor on the fuel pump/rail somewhere but that should give a code.
Thanks for this, yeah, so the fuel pressure sensor on the fuel rail was giving a code along with the immobiliser, so I think that’s my next step, get one ordered. I’ve tested the filter and all good.
 
Did the diags give the fuel pressures low/high?
HP regulator is a know common issue, ask me how I know.

EDIT: I don't remember seeing any fault codes.
i need to triple check with the mechanic, but he said that the fuel pressure sensor was throwing up a code (this was all in French and I’m still learning so didn’t get all the info)
 
Only one is relevant! Check the ECU connectors for corrosion (,i expect you already have though,)
Yeah have been through all the plugs on the ECU and tested for ground, live etc etc … for example, I was able to confirm that I am getting pulses of electricity to the injectors
 
right, it cranks, the injectors energise, but it wont start.. you know there is a fuel (pressure?) related issue and you sent the ecu away to be meddled with...
 
right, it cranks, the injectors energise, but it wont start.. you know there is a fuel (pressure?) related issue and you sent the ecu away to be meddled with...
Well I was told by another mechanic and the previous owner that the likely cause was the immobiliser…. Then another mechanic, came and did a diagnostic and told me to deactivate the immobiliser, and if that doesn’t work then replace the regulator… … seems I shouldn’t have listened to him, but doing my best
 

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