Engine Question

secondcurve · 10-15-2008, 08:01 PM

Quote:

Originally Posted by NBR

I believe the water would have to come from condensation and is not connected with FI or carburation. Keep the tank full but I doubt if it is a serious issue. I think metal tanks are much more prone to condensation than plastic ones. A little "Sta-Bil" also helps.

NBR:

This is exactly what the mechanic said. When the motor heats up and then cools down condensation accumulates inside. I'm not sure why Fuel Injection is not prone to this problem, but according to this knowledgeable guy it is. He told me that the way I should handle the carb motor is to take any gas left in the plastic tank at the end of the weekend and pour it into my car gas tank. Then I should run out the motor until it stalls. Does anyone out there use a 4-stroke 25 horse Mercury with a carb? I'd be curious to hear about your experience.

Audiofn · 10-15-2008, 09:31 PM

There should be no difference between a 2 and a 4 stroke with a carb. The fuel delivery is esentially the same. I have run 2 stroke carb motors for a while with very little issues.

I disagree with running them dry. The problem that I have seen with the new fuel is that as it dries up it powders/chocks up and clogs things. I would think that running it dry would make things worse. There will still be fuel left in the carbs even after it dies. If you leave lots of fuel in the carbs I would think that it would be less likely to have this issue. What I see is that the people that use their boats have less problems and the ones like me lately (building a house is taking all my time) are having issues. Water in fuel from everything that I have ever read will effect fuel injection worse then a carberator. I would not worry about carb vs. fuel injection just buy what you think is the best deal and use the heck out of it

10-15-2008, 09:31 PM	#2
Audiofn Senior Member Join Date: Sep 2004 Location: Bedford, MA/Naples, ME Posts: 162 Thanks: 3 Thanked 2 Times in 2 Posts	There should be no difference between a 2 and a 4 stroke with a carb. The fuel delivery is esentially the same. I have run 2 stroke carb motors for a while with very little issues. I disagree with running them dry. The problem that I have seen with the new fuel is that as it dries up it powders/chocks up and clogs things. I would think that running it dry would make things worse. There will still be fuel left in the carbs even after it dies. If you leave lots of fuel in the carbs I would think that it would be less likely to have this issue. What I see is that the people that use their boats have less problems and the ones like me lately (building a house is taking all my time) are having issues. Water in fuel from everything that I have ever read will effect fuel injection worse then a carberator. I would not worry about carb vs. fuel injection just buy what you think is the best deal and use the heck out of it