after i changed my fuel pump and my car wont start after on a Nissan 350z

yeah ill give it another try tomorrow morning cause i change it back to the old fuel pump now and it won't start to.

Check for a blown fuse .. Should be in the under hood fuse box.

I checked last night and the fuse is good too

Well since the pump was working before - I was thinking ‘now’ there is a blown fuse that is a result of the work that was done - which it still may be! ... Highly recommend TESTING each and every fuse on the vehicle using a test light. IF ‘ALL’ of the fuses do indeed TEST ok - problem must be within the fuel pump itself OR the wiring circuit / connections.