I am working on a 2001 K2500 with the 6.0L and it came in not running. I pulled the fuel tank since it was sucked in and I replaced the fuel pump and purge solenoid with the updated relocation for the vent. I also replaced the fuel filter and gas cap. Is there anything else I should replace to avoid the gas tank being sucked in again.

It would be a blocked vent or gas cap that caused the tank to collapse in the first place.
Seems you have covered those bases.

Roger.

wow thanks for the fast response.

This place it pretty good about quick responses, and this is a prime example!

the relocated vent valve would take care of it i would think, if that was stuck shut that might happen

Aw shucks... thanks guys.

Roger.