Fuel Smell in the Cabin or p0455 code
An easy fix but time consuming and it will cost you about 90 bones. Basically, the gasket around the fuel regulator has gone bad and causing the fumes to exhaust into your cabin thru the electrical portals. The only way to get at the FR is to drop the tank. It only takes about 30 minutes to do this. Before I get into the details, I would make sure you have access to the part. I had to special order the FR as Chrysler wants to sell the entire fuel pump assemble for about $300. I thought about making my own gasket but as you will see, because the regulator can now move about on top of the fuel pump, it actually does damage the fitting and only get worse over time. Another sympton you might be experiencing is the engine does not start straight away, the reason, the FR is not keeping fuel pressure and the pump has to reinitiate fuel to the fuel rail. If sitting, the pressue leaks down thus, the large or gross leak code you are getting.
Back to dropping the tank, DISCONNECT THE BATTERY before you do anything.
1. remove the tank straps. There is a 14mm nut which needs to be loosened in order to remove the strap hangers. No need to remove the nut entirely, just enough to "unhang" the strap from the bottom of the floor. I proped the tank with small "hard" cooler to keep the tank in place as I was removing the straps. Let the straps drop as the front the strap will allow the tank to drop.
2. Remove the fuel, short connector which connects the fuel line to the actual tank. You will have to press in the pins on each side to remove this short line both at the line and the tank. Not a big deal, use your fingers.
3. remove the vacuum line to the center of the tank.
4. Unplug the electical to the tank. This is a pain the *** so be careful not to damage the plug. I damaged my plug to a degree, in that I broke off the outer piece as it was sealed from years of grime, mud, etc. I used a tie to put back together thru the wires and around the plug to make sure the plug would stay connected. I then lubricated well to help with sealing and then tapped with electrical to form a barrier to keep out the grime to assit the next victim.
5. remove the plate underneath the fuel door to access the vent hose and the fule hose. remove the two clamps. I actually replaced the vent hose as mine was starting to rot. After pulling the hoses off, put an old clean rag into the hoses and tape. As you are moving the hoses thru the frame, this will prevent dirt from getting in the hose.
6. slowly, push the tank away from the fuel door and pull the hoses thru the frame to allow the tank to be completely removed.
7. Remove the FR, make sure to clean the grime around the portal and make ready for the replacement.
8. Replace part and reverse step the process.
Hope this helps