It was not the split hose.... - I finally got it all assembled, and tried starting it but its still dying on me - 10 sec then shuts off
Tried to put some more fuel in to it on the fuelling table and that made it possible to keep it idling (badly) its misfire badly and a quick small push on the throttle and it cuts out.
So it could be that it still getts to little fuel to the injectors but manipulating the fuel table made them open enough to keep it idling.

I noticed a little electrical noise from the alternator when car is turned off. And that noise disapears if I unplug the ECU. Dont know what to make of that though.
Dammit