1998 Yamaha 2 stroke outboard fuel in airbox and fuel coming out of exhaust

[Reelyknotty]

Burnt way too much fuel actually approximately 13 to 15 gallons in a span of about 4 to 5 MI which is absolutely ridiculous replaced plugs checked water fuel separator and limes had fuel slick behind a boat in bilge never turned on so it's not leaking from tank then I noticed didn't notice big brown bubbles coming out of exhaust as well took air box off and there was probably 4 oz of fuel in the bottom of the airbox please help

[TownsendsFJR1300]

Size of the engine, model?

I'd pull the air box, put the engine on muffs and check for fuel flowing out the carbs...

Squeezing the primer bulb alone may show a fuel leak in the area of the carbs.

Sounds like a float stuck open allowing fuel to pour into the engine or a leaky/bad fuel line.

One cylinder is likely soaked with fuel (running rough) and the spark plug would be black from the excess fuel (to help narrow down which carb).

[99yam40]

check fuel pump also,
but that would leak into the crankcase not out of the carbs if this motor has carbs

[Reelyknotty]

Couldn't show it in a picture or video but there was Big Brown bubbles coming out of exhaust had the cowling off while in the water could not visibly see anywhere fuel was coming out

[99yam40]

we still have no idea what motor we are talking about

[TownsendsFJR1300]

we still have no idea what motor we are talking about

Plus one ^^^^. What engine do you have?


Your brown bubbles are very likely some of the excess fuel getting sucked into the engine and eventually out the exhaust.



.

[Reelyknotty]

They say 1998 Yamaha 90 horsepower 2 stroke outboard

[Reelyknotty]

I'm sorry about last post it is not they say it is a 1998 Yamaha 90 horsepower 2-stroke outboard

[pstephens46]

I'm sorry about last post it is not they say it is a 1998 Yamaha 90 horsepower 2-stroke outboard

Couple model numbers that year. Which one?
Who is “they”?

[DennisG01]

Burnt way too much fuel actually approximately 13 to 15 gallons in a span of about 4 to 5 MI which is absolutely ridiculous replaced plugs checked water fuel separator and limes had fuel slick behind a boat in bilge never turned on so it's not leaking from tank then I noticed didn't notice big brown bubbles coming out of exhaust as well took air box off and there was probably 4 oz of fuel in the bottom of the airbox please help

I have an idea to pass along, but first, can you please redo this? It's really hard to read. Please go back through and add appropriate punctuation and proofread. I just want to make sure I'm completely understanding you.

And, same question as the others... for clarification, what's the model number?

[99yam40]

they all have the same carb set up, so post #2 should cover what is happening.
if fuel is getting into the silencer(air box) it has to be coming out of a carb or a leaking fuel line