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If your engine is running rich (burning too much gas), that will certainly increase the amount of unburned gas in the exhaust system. When the fuel mixture is out of spec, it can cause your car to burn much more or much less gas. When a fuel pressure regulator starts to go bad, it will change the engine’s air/fuel ratio and will cause it to either burn too much or too little fuel. Issues that you may be having with your fuel pressure regulator could also be the reason you smell gas while you’re driving your car. Keep an eye on your gas mileage, and if you see a decrease in fuel efficiency that comes along with smelling gas when you start your car, a bad fuel pressure regulator could be the culprit. So, that could also be what you are smelling. When your fuel pressure regulator fails, it can cause fuel to burn too lean (thin) or too rich (thick).īurning more fuel than you need wastes gas and causes unburned fumes to build up in the exhaust stream. 2.Bad Fuel Pressure RegulatorĪnother issue that may cause you to smell gas when you start your car is a failed pressure regulator. If it is, then it will also cause you to smell gas when you start your car. So, there is a chance your gas cap is installed correctly, but it’s just worn out. The seal on your gas cap can develop cracks and can break over time. In this best-case-scenario, and depending on the design of the car, this could cause fuel fumes to end up in your vehicle.Īlso, even if you made sure to put your gas cap back on, you should still take a look at it. There is a chance you simply forgot to put your gas cap back on after fueling up your vehicle. The absolute very first thing you should check if you smell gas when you start your car is check your gas cap. Why Do I Smell Gas When I Start My Car 1.Gas Cap Issue Why Do I Smell Gas When I Turn On The AC In My Car?.Is It Safe to Keep Driving If I Smell Gas?.Car Smells Like Gas When I Start It But It Goes Away.
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