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Posted
17 minutes ago, kram said:

 

Huskys are known to use poor quality Orings on the carbs accelerator pump. My cs340 was only a couple months old, only a few tanks through her when the carb failed. Motomix and aspen would have rotted the oring just the same.

 

 

Thats the thing though , Alkylate fuel does not attack rubber components . Pump fuel does take the coating off but keeps the rubber supple because its slowly attacking it , When people switch to an alkylate fuel and the rubber fails they automatically blame the alkylate fuel as the rubber now has no coating on it to keep it supple and has gone brittle . The alkylate fuel is only showing up what the pump fuel has been doing . Use an alkylate fuel from the get go , no problems . If changing to an alkylate fuel after prolonged  pump fuel use , change out rubber components ,

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Posted
15 minutes ago, Stubby said:

Thats the thing though , Alkylate fuel does not attack rubber components . Pump fuel does take the coating off but keeps the rubber supple because its slowly attacking it , When people switch to an alkylate fuel and the rubber fails they automatically blame the alkylate fuel as the rubber now has no coating on it to keep it supple and has gone brittle . The alkylate fuel is only showing up what the pump fuel has been doing . Use an alkylate fuel from the get go , no problems . If changing to an alkylate fuel after prolonged  pump fuel use , change out rubber components ,

I owned the saw from new and have never used alkylate fuel.

You say it does not attack rubber, that is untrue and depends entirely on which grade of rubber.

 

There are many grades of rubber and in this case Husq had used unsuitable rubbish.

Nitrile rubber can be fuel resistant, slightly less so with ethanol fuels (but there are still a great many old cars on the road!). Viton rubber is generally considered best for long term use.

 

One problem I believe to be true, there is so much low quality or fake fuel hose being produced that it can get into genuine supply chains. I assume the same is true for seals etc..

It is difficult to buy decent aftermarket fuel hose for a motorbike for example. It is suprising if a manufacturer is having issues on new kit from the factory, but does seem to be the case.

 

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