Putting mothballs in the gas tank does not improve a car's performance. That was not always the case, though. Gasoline used to have such a low octane rating that adding napthalene, which was the active ingredient in old mothballs, did in fact increase the octane rating.
Most mothballs manufactured today are not made of napthalene, but of para-dichlorobenzene, which does nothing for a car's engine. While it is still possible to use mothballs made with napthalene in a gas tank, doing so is unnecessary with today's higher-octane gasoline. Also, mothballs have a tendency to gum up engine parts so are best left outside of a gas tank altogether.Learn More
Putting sugar in a gas tank may clog up a car's fuel filter, which could make changing the filter more frequently necessary, but it's unlikely to enter a car's fuel line and cause any serious problems. There are no particular chemical properties of sugar that make it react negatively with gasoline, and any problems caused by pouring sugar in a gas tank come merely from its granular qualities.Full Answer >
The effects of putting syrup in the gas tank of a car depend on how far the syrup gets into the fuel system. If the car is started and run for any length of time, the syrup can end up clogging the fuel filter, which can cause the flow of fuel to be restricted, and in turn can cause the engine to stop running. If the syrup gets to the filter, the gas tank may need to be replaced.Full Answer >
When antifreeze is poured into the gas tank, it can cause damage to the vehicle.The vehicle may not start or it will begin to sputter if it is drivable. If the driver continues to operate the vehicle, the antifreeze could possibly ruin the engine.Full Answer >
Sugar does not dissolve in gasoline, so pouring sugar into a gas tank could clog up the filter of the car. If enough sugar is poured into the gas, it could disable the car, although this does not always happen. Pouring sand into a gas tank could have the same effect.Full Answer >