Anonymous asked in Cars & TransportationMaintenance & Repairs · 8 years ago

how does Ethanol cause rubber fuel lines and carburator gaskets to become ruined?

is this true that there are rubber gaskets used in the carborators of small engines..such as leaf blowers and strimmers ? how about in lawn mower engines? also, how ethanol..(espeically if 10 percent of fuel contents) causes the rubber fuel lines to become nonusable or ruined? after how much time and how depends?

how likely can buy non ethanol fuel somewhere in town and why small markets seem to be the places to find it?

4 Answers

  • Huge
    Lv 7
    8 years ago
    Best Answer

    There are lots of different types of rubber some are solvent and chemical resistant but others are not. If you use an incompatible rubber it will harden and shrink leading to failure. LDPE, nitrile rubber, flurosilicone rubber and some neoprene products have excellent compatibility with ethanol (which is Methyl Alcohol)

  • 8 years ago

    Although the question seems more like a statement I am going to try to answer it anyone since I am so disgusted with people writing non-factual information about ethanol on the internet...

    First I am not pro-ethanol in conventional gas, but:

    Most engine problems blamed on "ethanol" are preventable and avoidable.

    When good, fresh E10 (10% or less) ethanol gas is used it will NOT "ruin" engine parts!

    Facts: Ethanol alcohol is a solvent, degreaser, cleanser, antifreeze, drying agent, water absorber...

    Oil and water do not mix.

    Current parts are UL-listed to withstand 10% alcohol concentration. There are older parts that "may" not tolerate ethanol, but these are few and far between...

    * The sole reason(s) too many are "ruining" their engines from E10 is because the gas was contaminated, phase-separated, water-contaminated, over-blended, sub-octane, stored too long and or simply put "bad" gas.

    Example: When E10 phase separates, you now have a very high concentration of alcohol (with water) at the bottom layer of tank--->Running this bad fuel will likely damage engine parts (b/c the concentration of ethanol in bottom layer after P/S is probably 60-90% alcohol) + after phase-separation the top layer octane drops--->Running sub-octane gas can/may damage engine.

    Bottom line: If you follow all necessary E10 precautions you should not experience engine "damage".

    While I am certainly not a fan of E10 gasoline I'm fed-up with listening to people who falsely blame (good) E10 gas for problems when the cause was solely because gas was contaminated-

    There's plenty of reasons to bash E10, (especially since it is a very unstable fuel type since it rapidly absorbs water and is often over-blended), but spreading misconceptions that "all" E10 gas will damage engines is totally false.

    BTW, If more tested gas at the pump you would quickly realize that all too often E10 gas sold contains far over the 10% legal limit for ethanol and often is already contaminated with water at time of purchase. (Testing is simple, quick and very cheap).

    In answer to your 2nd question: Many areas no longer sell non-ethanol fuel - Reason is mostly due to political and/or profit motives - A few states have mandatory blending laws, but even in those states there are exceptions for specialty engines buying E0.

    Strongly advise you sign petition for "Ethanol-Free Fuel Choice" if you want to protect your rights to buy ethanol-free gas in the future...

  • 6 years ago

    You should not be fed-up with consumers. The root cause of many of our engine problems appears to be ethanol because we consumers don't know when it is contaminated, under-blended, over-blended, has absorbed water or has stratified, etc. etc. Most of us are not equipped to do a chemical analysis prior to purchasing gasoline at our local service station.

  • 8 years ago

    How many more times do you want to ask the same question?

    Stop wasting everyone's time and refer to the previous excellent and comprehensive answers you have already received.

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