fuel injectors cleaned now wont start

[tukn22s]

95 suburban tbi my problem is with my fuel injectors or accelorator pump. all i did was take apart injector holder or whatever it is had them flow tested and checked at napa put them back in, new gaskets & filters & o rings and install a new accelorator pump gasket wouldnt start. I put my frinds fuel injector piece w/accelorator pump started right up does anyone know what i did wrong there is only one way to install the accelorator pump gasket with the seat against the spring right? i even put the old one back in same no gas wont start