I have a 2012 Dodge ram Big Horn with the 5.7 engine and the large fuel tank. A week ago I dropped the fuel tank to replace the fuel pump and fuel level sensor which went well. This week I threw codes of p0440 and p0456 for EVAP system and evap small leak. I cleared the codes and they came back 2 days later. I've inspected the EVAP lines and everything looks good. Before I start replacing the sensors or dropping the tank again, any suggestions on where to look first? Is this possibly throwing codes temporarily because I disconnected the lines when I drop the tank and it will go away on its own? And for those wondering, yes, the gas cap is screwed on tight.

 

Smoke test the evap system.... Maybe there is a hose that just needs tightened.