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Pump Gas Question
When running a 602/604 crate, is it ok to run 91 Octane gas (as opposed to the recommended 92)? Is it a must to get gas that is Ethanol free?
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Ive ran Shell 93 pump gas for years in both 602 and 604 crate engines with zero issues. Anything lower octane I really haven't tried.
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Is that Shell 93 Ethanol free? Thanks
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Originally Posted by
LM1M
Is that Shell 93 Ethanol free? Thanks
to check for ethanol free, put 2 oz distilled water in a graduated bottle. fill most of the way full and mix well. let stand for a few minutes. if have more than 2 oz water in bottom, likely not ethanol free.
Ethanol makes fuel more likely to vapor lock, especially on restarts. That was the problem I had. I put a return line on carb with a .040 jet in it to help prevent vapor lock. Has worked so far.
Last edited by 95shaw; 07-19-2017 at 09:39 AM.
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