Smoke from exhaust

[liquid_acid]

Boat was driving fine today. Came back a few hours later and started it up and smoke was coming from the exhaust and it was sputtering a bit.

I talked to a neighbor and he seems to think that I need to clean my water filter or my pump is overheating or failing. I have a 98 moomba outback. Has anyone had any experience with this or can help me out with any advise to start with

Thanks guys!

Chris

[REDFIVE48]

When mine was puffing a lot of black smoke and not running well, it was the MAP Sensor. Sorry, don't know how to tell you how to test that except by replacing it.

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[maxpower220]

What color smoke? Have you changed your fuel filter anytime lately? a little more info is needed.

[liquid_acid]

What color smoke? Have you changed your fuel filter anytime lately? a little more info is needed.

I've owned the boat for 2 months so I haven't changed the fuel filter yet. The smoke seemed mostly white with the odd black puff.

[liquid_acid]

So I'm sitting on the boat and have tried a few different things. Here is a little more info.

The carb seems to be getting gas just fine. Sounds like all cylinders are running fine. When I start the boat I have to give it quite a bit of throttle to get it to fire. Once it is fired, and I ease back to an idle, the idle speed slows down until it stalls. As it slows, it starts producing more white/grey smoke. If I rev the engine it seems to run fine at a higher rmp and no smoke.

Would this be bad gas, clogged fuel filter, water in the gas?

Thanks.

[DOCDRS]

I've owned the boat for 2 months so I haven't changed the fuel filter yet. The smoke seemed mostly white with the odd black puff.

what have you changed to give us some info

[liquid_acid]

I haven't changed anything. I checked the oil when taking it out or a test run. Oil has been recently changed.