HELP! - unknown fuel leak

[sthevoz]

Hello,

I am the owner of a motorboat "Skibsplast Sportsmann 14" (made in Norway) with a Johnson 40HP outboard (BJ40 BAER, 1994).

I have detected a fuel leak but I don't understand what's happen!?
When I sail, the boat and motor are OK, everything is working.

When my motorboat is moored (and quiet), that's OK.
But when the boat is moved (for example to go on board), a fuel spot (fuel smells) appears on the water, around the motor!

I have tried to see if something was not OK around the motor but I can't see anything (any fuel leak!)!?
I have disconnected the fuel but no change!
It seems that the fuel comes from under water....

Thanks for any help
Sylvain

 

[psteurer]

Re: HELP! - unknown fuel leak

Unfortunately, it is normal to have unburned fuel come out from the lower unit of a 2 cycle motor. This occurs especially if one does a lot of idling. But one usually does not smell raw fuel with this. I would suggest you remove the engine cover and look around starting at the hose where the fuel enters. Check all the hoses and fitting to see if there are any drips. It might be as simple as tightening a screw. Leaking fuel in the engine area is not a good thing and needs to be resolved.

 

[sthevoz]

Re: HELP! - unknown fuel leak

Hello, thanks for your answer.

I have disconnected the fuel house but that's the same thing!?

Does it means that the problem is located around the carburettor?

 

[psteurer]

Re: HELP! - unknown fuel leak

I would check from where the fuel hose enters the motor and continue to follow the path of the hoses. The fuel hose will go to a fuel filter on the engine block. From there there will be hoses that go to the carburetors and the primer solenoid. Sometimes the hoses from the primer solenoid can come loose. The primer solenoid is the part that is a cylinder with a red handle on it. Check with a flashlight and see if you see any leaks or disconnected hoses.