Please help

We have changed the engine in my s2 now it wont run

When you start her up it runs for 5 secs then cuts out. We have found out the problem but carnt solve it. We found out there is no fuel comeing out the 4 injecters The only reason it runs is because the 5th injecter(cold start) lets some fuel in then stops there is presure going to the metering unit but we even took the injecters of the metering unit and turned the car over and the fuel ony seeps out. Allso the pump is working

Any help would be great