If not the gas cap try the fuel lines. Smell around for strongest smell and start there. Don't use a lighter or any open flame as a light source.;)
Hi Ed.
this is all i could find at the moment.
Gas Cap Causing Gasoline Smell in Car. I know it may seem obvious, but a loose or missing gas cap can cause a fuel smell in your vehicle. You could even have a faulty gas cap that is leaking fumes. A faulty gas cap can also cause the check engine light to illuminate with a DTC on newer cars.
Gasoline Smell in Car, 5 Common Causes - Simple Car Answers
or go to this link and read up some more.
Smelled gas and check engine light came on Google Search
SOURCE: 2005 Dodge Durango gas smell around gas cap area
NO NO NO.....GO TAKE YOUR VEHICLE TO A SMOG STATION AND ASK THEM TO TEST THE GAS CAP FOR YOU. VISUALLY LOOKING AT A GAS CAP WILL NOT TELL YOU GOOD OR BAD. THEY CHARGE 10.00 AND WILL TELL YOU IF THE GAS CAP IS LEAKING. DONE IT TOO MANY TIME WITH DAIMLER CHRYSLER.
SOURCE: Gas smell with Subura Legacy
there is a recall on some of the fuel lines under the hood, they get old and leak.
SOURCE: driving home check engine light stated flashing truck lost power
Try checking the map sensor this is a common problem with these vehicles
SOURCE: 1996 F-350 7.3 Powerstroke , truck is running good
Blow by is what you are describing coming out of the oil fill cap. A little is normal, it all depends on the internal condition of the engine. I would not be to quick to say that you have glow plug issues. I would look at replacing the cam censor on the 7.3 engine there is a recall from ford for this on some model year 7.3 liter diesels
SOURCE: Ongoing P0441 purge code on 2003 PT Cruiser GT. I
if you have replace the purge solenoid the problem is either the vaccum supply hose is loosing vaccum or the purge side is hose is either blocked or cracked.
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