Ok so I have a strong smell of gas in my Durango. It is worse the higher the heater blows. Before you could smell it outside by the motor and inside the Durango. Now you only smell it inside. Months ago we did work to plugs, coils, and one injector. It went to a shop to have some work done for hitting a guardrail down the passenger side (cosmetic work). No check engine lights, no missing or weird driving. Just a strong smell. Most common issues it could be? I do not notice puddles under it... I looked at the motor and didn't see any wet spots. I didn't take casing on top off yet, like where the coils and fuel injectors would be on the passenger side.