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I can answer that a little. Moisture in the gas tank combines with the petrol/gasoline and causes the wax build-up. The wax is really only petroleum jelly - from the word petrol, really! It can be found naturally coming out of the ground at oil drilling sites. Oil field workers scrape the stuff off of the drilling pipes and use it to treat small cuts and bruises ..... and, obviously, Pharmacists have found a way to package it and charge us for what is essentially a waste by-product. Always keep your gas tank filled up, as aircraft pilots are taught to do, and don't leave a tank of gas un-used for months at a time, to avoid the moisture in the air from gelling with the gas and becoming a potential hazard.

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14y ago
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Q: Why does petrol turn to gum and why don't the gummy deposits dissolve in the petrol before they occur?
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