I attached the diagram for these codes. I would suggest following the P0453 first and seeing if that fixes both. If not, then you can perform the other which should take care of it.
I assume you measured on the fuel tank pressure sensor and got 4.7 volts? If this is the case then you need to move onto step HX20. I highlighted what you need because you don't have the codes mentioned so you need to proceed and measure resistance on the harness from the PCM to the FTPS.