by 
F Dubya
ANSWERS: 9
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They actually are dripping water. Usually, at least. Sometimes the engine may be running too rich and will drip gas. If there is water in the fuel, it will exit through the exhaust pipe, since it doesn't burn. High humidity will do this too. Moisture will enter the engine through the fuel-air mix and be expelled through the exhaust. The "dripping" happens when there is too much moisture in the exhaust to exist in the gaseous state.
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Short trips will cause this-condensation builds up in the system,then runs out the tail pipe as water.After 20 or so minutes of run time the drip will stop because the system has reached operating temperture.It may take longer on a cold cold morning
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Gasoline is mostly water. When a car is not completely warmed up the water vapor turns back to liquid form and drips out the tail pipe.
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Your right, I miss spoke myself. Water is a by produce of burning gasoline. For every gal. of gasoline burned you get almost a gal. of water.
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If we look into the chemical make-up of gasoline we will notice that it is made of Carbon, Hydrogen and then requires oxygen to combust. After the reaction, the by products are Carbon Dioxide and water. After we balance the equation it will look something like this: 2 C8H18 + 25 O2 to 16 CO2 + 18 H2O. You will notice that the byproduct contains water. This is part of the reason it contains water. Most of this is vaporized because of the intense heat created during combustion. Depending on the type of exhaust system the car has, the vapor may or may not condense on the inside of the exhaust pipes. This would lead to the appearance that it is dripping water. Also water can be either in the gas tank of the car or in the gas you purchase. The water is NOT part of the gas, but is separated and just ends up in your tank. Your fuel pump will pump the water into your motor and it will be vaporized and then be expelled out your exhaust system. Depending on if you have large or trace amounts of water it could effect how your vehicle operates.
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LSD ate too many tabs. please stay away from sharp or pointed tools!
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It can come from two sources: (1)condensation of moisture in the muffler and exhaust system. (2)Automobiles using unleaded fuel and out of tune. thus the rotten egg smell. #2 is not as noticable today with computer tuned engines. Also in out of tune engines it was not water but sulfuric acid caused by incomplete combustion in earlier unleaded engines.
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Condensation.
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sometimes, the engine is set to rich (to much fuel going to the engine, compared to the amount of air), so the unburned fuel drips out the exhaust pipe.
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