Not familiar with the TDI but I understand that there is quite a bit of electronic engine management system on it. You are not getting fuel so you need to sample your system to find out why. Suggest you start with a comprehensive block system diagram that will show the interlocks to the fuel system after the key is turned off. There is more there than just the shut off solenoid on the pump. I believe that they have a primary lift pump from the tank to the IP. Check that out too. Chances are if it worked before your work, it will run now. Probably a simple wire connector has been disturbed that is part of the start cycle.