That rotten egg smell in race gas
If you notice a rotten egg smell from the race gas you are using, the product may not be what you want.
During the refining process of true race gas, much of the sulfur is refined out of the product. Typically the more refined and the higher quality the product, the more sulfur gets removed until there is virtually no sulfur left. Because lower sulfur levels are achieved through the process of additional refining, and because additional refining is expensive, higher sulfur levels may be found in fuels where corners were cut in the manufacturing process.
Higher sulfur levels often results in a fuel that leaves behind engine deposits - a very undesirable characteristic of any fuel, especially a high performance race fuel. This happens because the additional refining steps used in the production of a quality race fuel also tend to reduce the amount of components in fuel that can lead to engine deposits.
The sulfur issue can be much more complicated and technical. This explanation puts it in a much more understandable format. The bottom line is, as a rule, you should avoid using fuels that smell like rotten eggs in your race engines.
