New Old thread- gas fumes in cabin 16V

[MDE3]

I have been chasing a gas fumes problem in the cabin for some time...my techs and I have identified several problems but still not soved the issue.

To Date:

Replaced line from tank to pump
Resealed fuel filter and lines
Replaced purge valve
Replaced Carbon canister
Replaced fuel cap (3 different ones..all new)
Removed tank and pressure tested/smoke tested to 16 psi (twice)

What is very annoying is that each of the parts replaced above except the fuel caps, were in fact defective ..loose carbon falling out of the canister, blocked vaccuum lines (with loose carbon), plugged/jammed eha valve, leaking fuel hose from tank to pump, questionable fittings at the fuel filter..replaced. There were leaks evident in some cases. all this and still more gas smell. None of this solved the problem.

I have not changed the eha since the smell started, but relaced it in August this year for different reasons. Gas odor started a month or so later. However there is no odor of gas in the engine housing, nor any visible leakage at the FD, EHA, or Injector coonection...I have had these before with no gas odor in the cabin also. It seems to be coming from the rear......

Now when leaving the car ovenight there is a strong smell of fuel in the cabin in the morning. When driving with the windows closed and the fresh air vent open..no odor. When driving with fresh air vent closed and heater/ac circuit blowing..no odor when driving with any of the above conditions open or closed, but if the drivers window is cracked an inch or more...strong fuel odor coming in...reduced cabin pressure from the window cracked creating lower pressure in the cabin..sucking fumes in. Assume through the rear vent which is right above the fuel door.

Am stumped.