diesel5599
Petty Officer 2nd Class
- Joined
- Sep 4, 2006
- Messages
- 169
OK so I just got back from having the 100hr service performed on my twin Yamaha F150 4 strokes. Just as I was leaving the manager asked me if I knew about ethanol in the local gasoline supply and what it was doing to outboards.
He showed me fuel lines that were eaten away from the inside in less than 100hrs of service, fuel water separators with seals that had been eaten away, a gas tank that was full of pieces of fuel line line, a fuel pump that was corroded almost beyond recognition, and $2100.00 worth of injectors that were ruined; all from a boat that had been running for only 100hrs since the last service.
His strong suggestion was to use one pint of two stroke oil per 10 gallons of fuel even though I have 4 stroke engines!! He said his shop had called Yamaha as more and more boat owners were needing thousands in repairs and Yamaha had no official answer, but unofficially condoned using the mixture that he mentioned.
He said that they reached that conclusion because none of the two strokes that had came through had the corrosion problem and the oil is creating a thin coat between the ethenol and the lines/injectors/seals etc.
Two stroke oil is so expensive ($25/bottle) that I asked if I could use maybe one per 20 gallons and he said it should be OK, its better than nothing. So I poured about 3/4 of a gallon of the stuff in my 140 gallon tank.
I don't know if this applies to I/O's as well, I would think it would since there's no oil in that fuel either. He did state that marina's that sell 90 octane 'marine ready' fuel do not contain ethenol. Neither option is cheap and as usual it looks like the cost of boating just went up yet again.
He showed me fuel lines that were eaten away from the inside in less than 100hrs of service, fuel water separators with seals that had been eaten away, a gas tank that was full of pieces of fuel line line, a fuel pump that was corroded almost beyond recognition, and $2100.00 worth of injectors that were ruined; all from a boat that had been running for only 100hrs since the last service.
His strong suggestion was to use one pint of two stroke oil per 10 gallons of fuel even though I have 4 stroke engines!! He said his shop had called Yamaha as more and more boat owners were needing thousands in repairs and Yamaha had no official answer, but unofficially condoned using the mixture that he mentioned.
He said that they reached that conclusion because none of the two strokes that had came through had the corrosion problem and the oil is creating a thin coat between the ethenol and the lines/injectors/seals etc.
Two stroke oil is so expensive ($25/bottle) that I asked if I could use maybe one per 20 gallons and he said it should be OK, its better than nothing. So I poured about 3/4 of a gallon of the stuff in my 140 gallon tank.
I don't know if this applies to I/O's as well, I would think it would since there's no oil in that fuel either. He did state that marina's that sell 90 octane 'marine ready' fuel do not contain ethenol. Neither option is cheap and as usual it looks like the cost of boating just went up yet again.
