Thanks a lot for the suggestions much appriciated, understand its nearly impossible to diagnose at at distance

But a little progress - unfortunately not 100% sure what to make of it....

Let me explain
In the small window of 10 sec with the car running, I managed to add some extra fuel in the fuel table in the rp lab software to keep it running.
So by adding a small amount of fuel I think it compensates for the low fuel pressure I have discovered. The fuel pressure is only 1.7bar with vacuum hose on, and 2.3bar with it off. And it runs better with the hose off. So roughly I am missing 1.3 bar fuel pressure at idle (not even possible to raise rpm as it just dies the moment I touch the pedal)

Though I am pussled that missing "only" 1.3bar fuel pressure can cause it to be not running. would have imagined it at least could be driveable.
What do you think? Is it possible that missing 1.3bar can cause this?
​
While I had it running at idle it showed no errors from sensors.

So I think that rules out a lot of things....
​​​​​The fact that it can stay idling by adding some fuel suggests to me that the ecu is ok, sensors are ok ignition system is ok. And I am back to fuel supply - or?

Earlier I did try and feed the pump from another powersupply and it behaved the same by cutting out. Then to me it seems it could be the pump on its way out, or the hose from pump to the rail.
But in the beginning of all this I also tried submerging the pump in petrol and it pumped lots of petrol through. When I almost blocked the outlet the pressure raised from it until the point where I blocked the outlet completely which made it almost stall. I thought it seemed fine back then?

If that test rules out the pump I am thinking it can only be fuel hose..
(the return hose fine as I can easily blow compressed air through to the tank)
​​​​​​​
Hope it makes sense - what am I missing?
​​