I have a 2000 Mustang
I have a secondary air injection pump CEL but I doubt that is affecting my gas as the only purpose of that is to heat up the catalytic converter.
Now when I fill my tank up to full, I saw it leaking from what looked like the top of the tank. Havent filled it up full since..
There is a strong raw gas smell coming from the rear of the car and my gas mileage is horrible.
Ive read that it might be the gas filler neck or gromet.
If so, how would I go about replacing this?