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One advantage to using unleaded race gas is that it will not poison catalytic converters or oxygen sensors when used in emissions-controlled cars. One way to improve the octane rating of an unleaded fuel is to add what are called aromatics, such as toluene, which is an industrial solvent. Unfortunately, such aromatics will attack rubber, making it swell and become soft. We’ve witnessed this in a street car using high-octane unleaded race gas. Often, high-octane unleaded fuels will especially attack older rubber fuel line or rubber that is not rated for fuel line use. According to Wusz, most quality fuel line made in the last 10 or 15 years should not be affected by these aromatics. But if you are concerned about whether your fuel line will be affected, Wusz suggests cutting a short section of fuel line and immersing it in the race gas in a sealed glass container and allowing it to sit outdoors for a few days. If the fuel line swells in the presence of this gasoline, this is an unsafe condition and you should View Related Article
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