K jet Starting issue

Car will only start if I physically hold the metering by head flap open. Otherwise no fuel to injectors.
I have refurbed metering head, new pump, fuel lines, etc.
Any idea What to check next. I saw a previous discussion on this but cannot find it.

i

as said in many posts needs fuel pressure test
wur possible cause
https://www.clubgti.com/forums/index.php?threads/how-to-set-system-wur-fuel-pressure.81658/

 Thanks, I'll double check. But a pressure checked out when I refitted metering head

Pressure checked out.
compression ok
Sparks ok
any ideas 

These pressure tests refer to a running engine. How can you message fuel pressure when car wont start?

5th injector not firing?

You can test without the engine running. If you put ( jet pressure into YouTube there is a video of someone doing it. Airbox is off the car and he's got it hooked up to fuel pump. Not saying that it might not need checking once it is running, but it should give you a baseline to work off. There was a long thread started by Pistol about 18 months ago. Loads of good stuff in there.

Got my can running! Only took a year. Running ruff.
Control pressure seems too high at 3 bar. System pressure ok just over 5 bar. Will run but revs very high. Drops when u press the throttle. I guess mix is way out.
Can you  adjust the control pressure?