1999 Mercury 2-stroke appears to be flooding

[mikemnd10]

Have been frustrated with my 3 cylinder Mercury 2-stroke outboard. If I disconnect the fuel line from the engine, the engine will eventually start and run until the float bowls are empty. According to one of the local marine repair technicians, he said it sounds like a stuck float bowl. Well, since then, I have completely dismantled the carb's two times. The first time I just disassembled, soaked the carb's in carb cleaner, and the second time put in new metering valves attached to the float bowl's (all 3 carburetors). There appears to be no gas in the float's to keep the valve on the bottom of the bowl.
But, not matter what I've done so far, as soon as I can get the motor running (without fuel line attached), then attach the fuel line, the motor dies. If you keep the line attached and keep cranking, after awhile you can smell gas. Fresh new gas, new fuel line/bulb. Also installed all new gaskets in the carb's. I also removed (3rd time) the carb's and on the bench, with a syringe forced gas into each carb, thinking with a stuck float bowl open, gas would flow flow out somewhere. That didn't happen.
Thanks in advance for any input...

 

[mikemnd10]

Re: 1999 Mercury 2-stroke appears to be flooding

Have been frustrated with my 3 cylinder Mercury 2-stroke outboard. If I disconnect the fuel line from the engine, the engine will eventually start and run until the float bowls are empty. According to one of the local marine repair technicians, he said it sounds like a stuck float bowl. Well, since then, I have completely dismantled the carb's two times. The first time I just disassembled, soaked the carb's in carb cleaner, and the second time put in new metering valves attached to the float bowl's (all 3 carburetors). There appears to be no gas in the float's to keep the valve on the bottom of the bowl.
But, not matter what I've done so far, as soon as I can get the motor running (without fuel line attached), then attach the fuel line, the motor dies. If you keep the line attached and keep cranking, after awhile you can smell gas. Fresh new gas, new fuel line/bulb. Also installed all new gaskets in the carb's. I also removed (3rd time) the carb's and on the bench, with a syringe forced gas into each carb, thinking with a stuck float bowl open, gas would flow flow out somewhere. That didn't happen.
Thanks in advance for any input...

Didn't do well for an answer with this question, so I would like to add to it, if anyone can help.
Regarding my faulty Mercury 60HP 2-cycle. Is it true that a faulty fuel pump could actually push an
excessive amount of fuel past the float valve, causing flooding, even if everything in the carb is
actually oK?

 

[carholme]

Re: 1999 Mercury 2-stroke appears to be flooding

What is your engine s/n and do you have a manual?

When you had the carbs out, did you do the carb float height adjustment?

Gerry

 

[mikemnd10]

Re: 1999 Mercury 2-stroke appears to be flooding

What is your engine s/n and do you have a manual?

When you had the carbs out, did you do the carb float height adjustment?

Gerry

Don't have the S/N handy, as the pontoon is in storage at this time. But, yes I do have the manual and set
all three of the carb floats with a caliper per the model carburetor I have.

Thanks Gerry!

 

[carholme]

Re: 1999 Mercury 2-stroke appears to be flooding

Have you checked to see if maybe you are having a problem with the anti-siphon valve? If you are not familiar with it, you can see page 3A-8 in Section 3, Fuel System.

Gerry