i need your help please peoples,

i have a 1989 escort turbo which i have just built from scratch it turns over fuel pump is buzzing i have fuel to the accumalitor then to filter onto metering unit i have fuel pressure to the metering unit, cold start valve, and return pipe but nothing to the injectors when i undo the black box on the side of the metering unit and move it slightly fuel appears at the injectors then it will fire up but not for long any idea,s