Rich mixture problem - solution?

[NF7]

What is the next step? My car is producing too rich of a fuel-air mixture, as I keep smelling gasoline if standing behind the car while idling. I know for a fact, that my car is not leaking any gas anywhere in the fuel line to the engine, as it was checked and re-checked.

I've replaced the filters, spark plugs, ignition coils. The problem was happening before, and I thought it would go away if I change those things.

 

[Pedro]

Scan the ECU too much fuel maybe be a case of checking for low air intake pressure (Map sensor) I would look also look at the Upstream/downstream lambda sensors? This can also be attributed to a faulty HPF pump?

 

[NF7]

Scan the ECU too much fuel maybe be a case of checking for low air intake pressure (Map sensor) I would look also look at the Upstream/downstream lambda sensors? This can also be attributed to a faulty HPF pump?

The ECU was scanned during the replacement of mentioned parts. No issue was found.

 

[Pedro]

Did they check the High/Low fuel trims?
I would change the Upstream Lambda sensor or replace altogether
The only other possible is the Air/Fuel ratio is all adrift whereby more fuel is being added so its poss a map/maf sensor issue
Maybe you have a timing problem ?