Hopefully you didn't break or crack one of the hose barbs on top of the tank. The bulkhead for the filler and vent hoses is very vulnerable, the plastic that DCA used on a number of them isn't very compatible with ethanol and a number of them have crazed and cracked. I've had to use two part epoxy to rebuild areas that cracked and leaked. No new tanks and good used ones are extremely rare.
The P0455 is a MF. I've had it off an on for awhile. I've used a smoke machine and hand a hand held vacuum pump in order to locate bad hoses. i think i've replaced every hose cracked or not except the one on the fuel filler. I even ordered a new mopar gas cap. I didn't change the gasket on the gas tank when i got a new fuel pump last year. i'm looking at knocking that out next weekend.
oooofffff all the effort to change the pump and not the gasket while your already there?
Maybe I'm just anal but If I'm taking the dive I'm doing it all once and hope I didn't screwy something up in the process.
Seems like I had that code once and it was the pcv valve.
Memory is a little foggy I have a few vehicles I'm always doing something to
It is likely the "U" shaped hoses on the charcoal canister have split. I have gone through 3 sets in less than a year. The rubber compound they are using is crap. Need to find alternative, likely silicone.