dmpatanis Posted January 7, 2011 Share Posted January 7, 2011 Hello,i was wondering how long days can we leave the fuel/oil mixture in the gas tank without lose the oil lubrication characteristics??? I have left my own fuel/oil in the tank for one week(7 days)now and i dont know if its Ok to leave the current fuel,or to put it out and fill with a new one??? Thanks a lot. Quote Link to comment Share on other sites More sharing options...
aquatix Posted January 7, 2011 Share Posted January 7, 2011 A week is fine. Simonini recommend discarding fuel after that but a good quality synthetic oil should be OK for a couple of weeks. With powerboat engines we always used to disconnect the tank and run them till all the fuel was out of the carburettor, but this is a bit impractical with most paramotors. Worth doing if you don't plan on flying for a couple of months though. Might be worth priming the carb with the bulb or even turning the engine over a few times every couple of weeks (if not flying) to prevent gummy deposits forming in the carb through evaporation. Quote Link to comment Share on other sites More sharing options...
Guest Posted January 7, 2011 Share Posted January 7, 2011 I have to be honest.... I have used mixed petrol well over 'weeks' old! I have found cans in the back of my landrover that have been buried there for almost 6 months!! I was flying with is on the 1st, 2nd, 3rd, and 4th of Jan. Its now all gone I am not recommending anything here.... I am just telling it how it is. I use Castrol 2T and normal unleaded with the occasional treat to some posh stuff. SW Quote Link to comment Share on other sites More sharing options...
treehopper Posted January 7, 2011 Share Posted January 7, 2011 As Simon has just said, it lasts for ages, just give it a good shake before use to remix the oil. Quote Link to comment Share on other sites More sharing options...
paramotormike Posted January 7, 2011 Share Posted January 7, 2011 Yes, I can agree with Simon. I've used some well old fuel, with Castrol TTS added I have had no problems. I read the octane rating will go down, but didnt really notice any reduction in power. Thats how its worked for me! Mike Quote Link to comment Share on other sites More sharing options...
norbertflyer Posted January 7, 2011 Share Posted January 7, 2011 Agreed with Mike, never been able to tell premixed 'old' or 'new' fuel, even after a 4 month spell in hospitals in the past, engine started first time and no issues in flight. I do tend to stop the engine on the choke for the end of the last flight, seems to start better next time. Had water in the fuel once, but I can only put that down to leaving the cap off the gerry can for a week and moisture was 'absorbed' into the mix. Richard. Quote Link to comment Share on other sites More sharing options...
aquatix Posted January 8, 2011 Share Posted January 8, 2011 Agreed with all above - I don't empty my paramotor fuel tank but I also tend not to mix fuel until it is needed or leave unused premix for more than 3-4 weeks. I don't think it deteriorates that much but always best to follow manufacturers guidelines: Quote Link to comment Share on other sites More sharing options...
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