i replaced the intake manifold on a bmw 325i now it wont start. on 2003 BMW 325i

I have power at the injectors and 51 psi on the fuel rail but it doesent seem to be getting fuel. what might the problem be ?

Asked by for the 2003 BMW 325i
Are all the intake hoses hooked back up? Nothing else left unplugged? Did it run before you replaced the manifold?
thanks for the response. All of the plugs are connected but I have not connected the intake hose to the filter assembly yet.
It's mass air flow controlled , that's the problem, at least so far.