Gas/Oil Slick
 

Paul Dougherty wrote:

Hi,
I have a 1985 25HP Mariner 2 stroke outboard. After a run to a
fishing spot I stop the motor and after a few minutes there is a
rainbow of a gas/oil slick on the water. After a few minutes is
dissipates. What is causing this? I do not want to be a polluter. I
can not tell where this is coming from. The fuel lines do not have any
leaks.
Does anyone have any ideas?

Paul


Nothing abnormal with your elderly two stroke.

Gas/Oil Slick
 

Hi,
I have a 1985 25HP Mariner 2 stroke outboard. After a run to a
fishing spot I stop the motor and after a few minutes there is a
rainbow of a gas/oil slick on the water. After a few minutes is
dissipates. What is causing this? I do not want to be a polluter. I
can not tell where this is coming from. The fuel lines do not have any
leaks.
Does anyone have any ideas?

Paul

Gas/Oil Slick
 

If it really bothers you, try floating an oil absorbing "diaper" off the
transom when you stop.

You'll get some of the petro-chemical residue, but not all of it. Still,
capturing some is better than capturing none.

(If the slick was constant, you'd have to check for leaking fuel)

Gas/Oil Slick
 

Paul Dougherty wrote:

Hi,
I have a 1985 25HP Mariner 2 stroke outboard. After a run to a
fishing spot I stop the motor and after a few minutes there is a
rainbow of a gas/oil slick on the water. After a few minutes is
dissipates. What is causing this? I do not want to be a polluter. I
can not tell where this is coming from. The fuel lines do not have any
leaks.
Does anyone have any ideas?

That's normal for a 2-stroke, especially an older one. A little unburnt
gas/oil mix always finds it's way from the intake to the exhaust port
since they're both open for a brief moment. In the water, a very small
amount of gas and oil can look like a lot.

If you're really concerned about it (I'm wouldn't be), you can move up
to a 4-stroke outboard.


--
~/Garth - 1966 Glastron V-142 Skiflite: "Blue-Boat"
"There is nothing - absolutely nothing - half so much worth doing
as simply messing about in boats."
-Kenneth Grahame, The Wind in the Willows

Gas/Oil Slick
 

It could be normal but if it has increased suddenly it could be a bad fuel
pump. I had an increase of post-shutdown leakage on a 225 Merc. A few
trips later it started running rough. The mechanic found that the fuel pump
had a leak into the crankcase. Fixing it solved both problems and also
improved fuel mileage.


"Paul Dougherty" wrote in message
om...
Hi,
I have a 1985 25HP Mariner 2 stroke outboard. After a run to a
fishing spot I stop the motor and after a few minutes there is a
rainbow of a gas/oil slick on the water. After a few minutes is
dissipates. What is causing this? I do not want to be a polluter. I
can not tell where this is coming from. The fuel lines do not have any
leaks.
Does anyone have any ideas?

Paul

Gas/Oil Slick
 

Thanks for all the replies. This seems to be a normal issue. I will
look into the fuel pump though.
Paul

"Bill S" wrote in message . com...
It could be normal but if it has increased suddenly it could be a bad fuel
pump. I had an increase of post-shutdown leakage on a 225 Merc. A few
trips later it started running rough. The mechanic found that the fuel pump
had a leak into the crankcase. Fixing it solved both problems and also
improved fuel mileage.


"Paul Dougherty" wrote in message
om...
Hi,
I have a 1985 25HP Mariner 2 stroke outboard. After a run to a
fishing spot I stop the motor and after a few minutes there is a
rainbow of a gas/oil slick on the water. After a few minutes is
dissipates. What is causing this? I do not want to be a polluter. I
can not tell where this is coming from. The fuel lines do not have any
leaks.
Does anyone have any ideas?

Paul