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Gas in a 2-stroke dissolving plastic...

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#1 toonces

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Posted 10 August 2020 - 02:54 PM

What would cause this?  I have a roto-tiller from Yard Machines, aka MTD LLC of Cleveland, OH.  It has a huge, powerful 31cc 2-stroke (looks like the engine manufacturer is Zama, from China) that has recently dissolved the plastic hoses from the gas tank into the carb and the tank to the bubble primer.

 

What caused this?

 

 


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#2 DuncanDad

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Posted 10 August 2020 - 02:55 PM

ethanol in the gas can do that.


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#3 Stains_not_here_man

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Posted 10 August 2020 - 02:55 PM

Ethanol can
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#4 toonces

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Posted 10 August 2020 - 02:56 PM

If it's ethanol, no clue how it would have got there.

 

What else ya got?


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#5 Vagus

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Posted 10 August 2020 - 02:57 PM

God damned animals, leave the ethanol alone!!!


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#6 TonyBrown

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Posted 10 August 2020 - 02:59 PM

If it's ethanol, no clue how it would have got there.

What else ya got?

ethanol is in almost all gas, how could it not get there??
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#7 DuncanDad

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Posted 10 August 2020 - 02:59 PM

If it's ethanol, no clue how it would have got there.

 

What else ya got?

The gas at the pump will usually contain up to 10% ethanol unless you bought ethanol free gas.

This is why I buy the cans of premix from HomeDepot. Sure, it costs more per gallon but, I know it's mixed properly and has no ethanol.


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#8 porter

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Posted 10 August 2020 - 03:02 PM

How old is the tiller? I think newer small engines are designed to be compatible with ethanol containing gas.
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#9 Vagus

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Posted 10 August 2020 - 03:06 PM

Maybe them suns light?  The star makes this like electro.. electro ... #### it, its magnets man. And then the plastic gets ... gets ... that photolytic gots.  


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#10 toonces

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Posted 10 August 2020 - 03:08 PM

How old is the tiller? I think newer small engines are designed to be compatible with ethanol containing gas.

Trying to find that out right now.  The MD and SN are faded out.


ethanol is in almost all gas, how could it not get there??

Been using the same gas for a long time.  I guess it's possible it just now failed.


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#11 toonces

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Posted 10 August 2020 - 03:11 PM

Trying to find that out right now.  The MD and SN are faded out.


Been using the same gas for a long time.  I guess it's possible it just now failed.

Looks like it might be 2004


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#12 toonces

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Posted 10 August 2020 - 03:21 PM

Looks like I can still get replacement parts...


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#13 Patrick C.

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Posted 10 August 2020 - 03:24 PM

Are the hoses rigid plastic rather than some kind of elastomer? Seems odd, but either way my guess is they cheaped out on the material and didn’t use something that would hold up to gas, ethanol, and UV long term. You should make new hoses from whatever lines Vagus’s stomach.
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#14 toonces

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Posted 10 August 2020 - 03:30 PM

Are the hoses rigid plastic rather than some kind of elastomer? Seems odd, but either way my guess is they cheaped out on the material and didn’t use something that would hold up to gas, ethanol, and UV long term. You should make new hoses from whatever lines Vagus’s stomach.

Not hard rigid plastic.  Looks like clear vinyl with the main gas line tinted green and the primer being clear or slightly yellow.

 

My initial thought was to try to get clear vinyl from the local hardware store.  But then, saw the main gas line is just press fitted into the tank.  And trying to find metric sized vinyl tube might be tough.


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#15 dondewey

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Posted 10 August 2020 - 03:36 PM

The hoses on my shitty weedwacker from 2012 did the same thing. Lasted about 5 years
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#16 Car ChuckRam

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Posted 10 August 2020 - 03:49 PM

Just buy some regular rubber hose, and cut it to length.  The press fitting should be a barb that unthreads from the tank.  If it’s molded, you might be out of luck. 

 

Parts are so cheap now, I don’t bother with non ethanol for my 2 stroke tools. 


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#17 LowcountryBrewer

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Posted 10 August 2020 - 03:51 PM

Just buy some regular rubber hose, and cut it to length. The press fitting should be a barb that unthreads from the tank. If it’s molded, you might be out of luck.

Parts are so cheap now, I don’t bother with non ethanol for my 2 stroke tools.

Gas is so cheap now, why not use non-ethanol?
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#18 toonces

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Posted 10 August 2020 - 04:06 PM

Gas is so cheap now, why not use non-ethanol?

Finding non-ethanol in New Mexico is near to impossible.


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#19 djinkc

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Posted 10 August 2020 - 04:16 PM

This is why I have zero 2-stroke engines for yard work.  When the mower dies (4-stroke) I'll get an electric and be done with it.  Ethanol belongs in things other than gasoline


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#20 TonyBrown

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Posted 10 August 2020 - 04:40 PM

Ethanol is awful especially for marine applications
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