fuel spillage while starting

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Alan

I’ve noticed a little fuel spillage out of the exhaust after starting the Yanmar. More so when it hasn’t been used in a while. I followed the manual for starting and I even tried less throttle. Some times I can start the Yanmar without any throttle at first which produces the best result. But I can only do that if it has been started within a few days. Why is it flooding? Is this happening to others?
 
J

Jim Hackett

You're Not Alone!

Yes I hate to admit it but after long periods of time without starting the engine I notice a small sheen in the calm waters. And I'm always extra careful about such matters. Like refueling.
 
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David Straub

It's a fact of life.

Just finished taking a 10 week marine deisal repair class. It was offered through our local community college. Everyone asked a lot of questions. Yours was one of them that was asked and answered. Our yanmars have an automatic throttle set when you are starting. So it does not matter where you put the throttle, your engine knows better and will set itself. As soon as it starts you are back in control. While it is trying to start, your engine is pumping fuel into the cylinders. OK so it's not so smart, but thats what it does. There is no way to avert it. Our teacher with 30 years of marine deisal experience assures us of it.
 
Aug 11, 2006
1,446
Hunter H260 Traverse City
Yanmars spit

Correct, perfectly (unfortunately for our harbors!) normal. The initial fuel "spit" will be darker if the engine has been idle for a long period of time. I try to follow the Yanmar recommendation of running my engine every ten days if I am unable to go out, which keeps the initial exhaust a bit less foul-looking on start-up.
 
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