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According to the available information sugar does not dissolve in fuel but rather acts like particulate matter much as sand.
"According to available information"? Try according to reality. Have you ever done any actual home lab type experiments to verify this bit of info? I've been present when a fuel system, intake, and heads from a car (carb) were taken apart after sugar had been dumped in the tank about a month earlier.
What does air have to do with the dissolution process? After the fuel/sugar mixture has been splashing around and is exposed to air, fuel will evaporate, sugar will not, it is left behind to either cling to container surface or settle even further. Also when this mixture goes into the cylinder chambers to be fired, you know. fuel/fire/air.
It would have minimal effect as a dissolved gas. Air and time will not make a dissolved solute crystallize. Perhaps you are thinking of evaporation of the liquid solvent leaving the solid solute. Anyway that doesn't apply if indeed sugar is not soluble in fuel. Even in the test report you sited, some sugar was disolved.
BTW- I'm not saying the sugar will plug every cavity like an injected foam filler type substance as the report's description would have you believe.
Sugar in the fuel is of course not a good thing. Why? If it doesn't disolve, just sits in the bottom of the tank, what harm is it doing besides taking up space in the tank?
The point is that the effect is not as we had been lead to believe. Itisn't harmless as you seem to think/have us believe either.
Sugar isn't anywhere near a harmless nuisance, it can and will cause severe internal problems,....given time.
Sugar isn't anywhere near a harmless nuisance, it can and will cause severe internal problems,....given time.
Where did you get the idea it's harmless? Certainly not from me. I don’t believe it’s harmless for two reasons. One is it’s effect as particulate matter. I certainly wouldn’t put sand in my fuel tank. More importantly is the fact that dissolution is only relative. Most organic molecules have some solubility in common solvents. The Merk index gives quantitative values for how completely one substance will dissolve in another. For example sugar would be completely soluble in water or alcohol, two similar solvents, but poorly soluble in hydrocarbons such as fuel. However this solubility will not be zero. So as you have suggested sugars may have some small solubility in hydrocarbons but is the concentration enough to cause harm when crystallized out of solution by “time and air”? Perhaps it is. I certainly would not test this on my SD. We really don’t have enough information to answer this, and certainly not enough to suggest it’s totally harmless. Personally I think the reality is somewhere between the potential harm from the particulate matter and the gunk your engine to hell theory. However the information we do have seems to be weighted toward the particulate matter idea.