The engine is likely running too rich. Check the spark plugs and clean/replace as necessary. Same thing with the air filter.
If there is a gas smell inside the passenger compartment of a car, there is probably an exhaust leak in the system. Have it checked immediately.
Absolutely not. If there is a strong smell of gas at the meter, call the gas company.
Old
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A gas called mercaptan is added which contains sulfur and has a foul smell. Adding this gas allows people to smell when there is a natural gas leak. If you find this strong smell in your house you should get out and call the Fire Dept. immediately.
If the oder is way strong, you might have a gas leak.
Methyl mercaptan.Related Information:This strong smelling additive to natural gas is used to warn us of leaks. Natural gas has no smell, taste, or feel to it. So a chemical, that is naturally detectable, is added. It has an offensive odor, something like rotten eggs: very difficult to ignore.
There could be many problems related to smelling gas and seeing white smoke from your tailpipe. Some suggestions would be the head gasket. If the smoke has a blue tint to it, it may be oil related. If your car has a turbo, it may be the turbo needing to be replaced. To be sure, you can have a mechanic do a diagnostic on it.
Strong smell
Sulphuric acid
Mercaptane is added to natural gas; this has a strong smell and an escape of methane can be easily identified.
A poisonous gas with a strong smell, that is used in industries and causes air pollution