Replaced side saddle tanks with rear cell

[HumbleChevyBuddy]

So, this past weekend I replaced my side saddle tanks with a rear mounted fuel cell. Now my truck won't start and I'm trying to figure out why. I moved the fuel pump (pictured below within the passenger side frame rail) closer to the new tank and I also moved the fuel filter back as well. Even with this it's still not starting. Is the fuel pump still too far from the fuel cell? Does anyone have a similar setup or can anyone give me some advice? Please keep in mind that the wiring and the plumbing is still not final...I'm just trying to get it all working first, then I can run everything correctly. I also included a pic from the rear so you all can see how I have the fuel cell line running from the fuel cell itself.

Thanks guys!