Yamaha 90 water in gas

[smudge]

Hi, I have a friend with a 1986 Yamaha 90. He gets it serviced every year or two and it only does 20 to 50 hours per year. The last service it had water in the carbs, he has used it once and same thing again. The tanks are plastic and portable, not underfloor. His mechanic is going to take the carbs off again and clean them. The tanks were cleaned at the service so I would be pretty sure its just water. Does condensation get into the tanks? I have never had a problem on my motor (Mercury) after 7 years, all I do is drain the carbs and clean the tanks, although I do rinse them out with meths from time to time.<br />Are Yamahas more prone to water in the gas?<br />My advice to him was to drain the carbs and try it.

 

[Capt Ken]

Re: Yamaha 90 water in gas

No, but the plastic tanks are real prone to gather water. The rubber gasket that seals them will dry out and allow water to leak into the tanks. Also if they have the fuel gauge on the fill cap, they also like to leak. If he wants to stop the water problem, either replace the tanks every year or so or go to a fiberglass or metal tank.

 

[partslife]

Re: Yamaha 90 water in gas

other option besides switching tanks you can get a water seperator that should take most of the water out of the fuel before it gets to your carbs. "there cheaper than a new tank too" good luck

 

[****63]

Re: Yamaha 90 water in gas

I have the same problem with my little outboard kicker. It's my fault really. I do not faithfully close the vent on the cap.It's hot duting the day and cool at night ,the tank expands and contracts like a big lung breathing in and out.Air goes in and out but the moisture stays in the tank. Nice thing about 6 gal. portable is that you can pick it up and peek inside ,see the water in the bottom corner and clean it out.I'm really good at destroying fixed tanks. For what it's worth that's my experience.<br />Good luck<br />Brian

 

[smudge]

Re: Yamaha 90 water in gas

Thanks for the replies.