200 Merc

[Fishmeister]

I have a '92 Bass Cat with a 200 EFI Merc. Boat has served me well over the years very little mechanical problems. I don't lake fish like I did, got a flyrod and waders so the boat has been sitting last several years. The motor will start and idle but when you try to get on plane the boat just stalls and will die if I don't back off. Seems to be alot of gas coming thru the exhaust, fim on the water. I do use Stabil and or Seafoam. Looking for recommendations of a good mechnic that is also resonable. I purchased the boat from Ulrich in Republic. I appreciate any suggestions.

Dave

[Fishmeister]

bump

[Dutch]

Bruce Tangora at Tangora's Marine in Nixa.

[denjac]

Try changing the water filter. Its screws on and off like an oil filter. Might be a cheap fix before taking it to the shop.

[Fishmeister]

I replaced the plugs and water filter after I discovered I had a problem, no improvement.

Thanks, for the heads up on Tangora's in Nixa.

[Cajunangler]

If you are still wanting to solve your own issue I have a couple of things to look at. First, since you say it idles but won't sustain higher rpm's it could be an issue with your fuel tanks vent. If you haven't used your boat very often a dirt dobber might have built a mud nest and clogged it up. Second, it could involve an issue with your fuel pump system. I had a fuel pump diaphram rupture years ago on my 200 yamaha and it caused all kinds of weird symptoms to occur. One of which included the motor running richer (too much fuel) than it should.

Just some thoughts on the subject. Good luck.

[Fishmeister]

Cajunangler,

The fuel pump diaphram might be the cause, how do you diagnose or test your theory? I do believe it seems to be running rich (too much gas). Do you just replace the fuel pump or is there some visual check that can be done?

Dave

[Cajunangler]

I was about to answer your question when it occured to me that you have an EFI motor. Mine used carbs and I would imagine the fuel delivery system could be very different on an engine with fuel injection. I would have to believe there would be a fuel pump similar to what we have on autos for EFI engines and you would probably need a fuel pressure gauge to see if it is working within acceptable range. Sorry, but I think my idea might not be an easy one to solve without proper equipment.

[Fishmeister]

I was about to answer your question when it occured to me that you have an EFI motor. Mine used carbs and I would imagine the fuel delivery system could be very different on an engine with fuel injection. I would have to believe there would be a fuel pump similar to what we have on autos for EFI engines and you would probably need a fuel pressure gauge to see if it is working within acceptable range. Sorry, but I think my idea might not be an easy one to solve without proper equipment.

Oh ya, the efi thing probably complicates things for self diagnosis, still think you might be right about the pump though.

[Larry Richards]

I have the same motor and had the same problem.I called my mechanic and he knew what it was right away.That motor has a small pre tank that vacuum fills with gas and that will let you run at Idle speed but if the fuel pump is bad or clogged it wont fill fast enough to to increase the speed.As I remember the way he tested it was when you increase the speed and when it starts to shut down pump the gas bulb if it continues to run the pump is bad.If it still stalls out there is something in the line blocking the gas flow....The only other and more likely possibility is that the power packs 1 or more are bad especialy if alot of gas is coming thru the exhaust