Pretty sure I found at least one of the leaks.

[Cuppy420]

also running too rich or too cold will cause fuel to get in oil, because not all fuel is being burned in the cylinders it leaks by the rings.
rea dup on motors making oil and what causes it


I mentioned this prime start system to you in one of your other threads you started on this motor problem.
does your motor have a choke to help starting cold?
read up on what those 2 devices are on #1 & #3 carb are, and how they work

So what else could cause it to run too rich or too cold?

 

[Cuppy420]

I mean...I gotta start the damn thing and it's going to be cold when I start it

 

[99yam40]

I don't have a prime cold start system. At least I don't think so I'm not even really sure what that is. It's a 2003 bass boat with a 50 hp motor

As far as I know I just push the key in and that's supposed to be the choke according to the previous owner

with the cowling off, listen and visually check to see if anything happens when you push the key in.

may be those 2 devices on the carbs 1& 3 operate when pushing the key, but that is not the way the prime start works on my C40 2 stroke.
just because you can push the key switch in does not mean it does something, but you can verify easy enough

I had a 35 Evinrude that squirted fuel into the carb when I pushed the key switch, but it also had a lever I could push on the carb if the electric part did not work

 

[Cuppy420]

with the cowling off, listen and visually check to see if anything happens when you push the key in.

may be those 2 devices on the carbs 1& 3 operate when pushing the key, but that is not the way the prime start works on my C40 2 stroke.
just because you can push the key switch in does not mean it does something, but you can verify easy enough

I had a 35 Evinrude that squirted fuel into the carb when I pushed the key switch, but it also had a lever I could push on the carb if the electric part did not work

I'll try that

 

[Cuppy420]

with the cowling off, listen and visually check to see if anything happens when you push the key in.

may be those 2 devices on the carbs 1& 3 operate when pushing the key, but that is not the way the prime start works on my C40 2 stroke.
just because you can push the key switch in does not mean it does something, but you can verify easy enough

I had a 35 Evinrude that squirted fuel into the carb when I pushed the key switch, but it also had a lever I could push on the carb if the electric part did not work

Want to know what I was just thinking? Another thing that could be flooding my oil with fuel is possibly a stuck float. Does that sound correct?

 

[99yam40]

that would not cause all cylinders to fowl their spark plugs, only the one with the stuck float

you may need to remove the silencer from the front of the carbs to see if there is fuel dumping into the motor due to a stuck float in one or more of the carbs

 

[Cuppy420]

that would not cause all cylinders to fowl their spark plugs, only the one with the stuck float

you may need to remove the silencer from the front of the carbs to see if there is fuel dumping into the motor due to a stuck float in one or more of the carbs

Are you talking about that big ass long plate that attaches to all of them?

 

[99yam40]

it is just a plastic cover, that helps keep the noise down.
you cannot see into the carb throats when it is in place

 

[Cuppy420]

it is just a plastic cover, that helps keep the noise down.
you cannot see into the carb throats when it is in place

Pretty sure I don't have one then

 

[Cuppy420]

Pretty sure I don't have one then

 

[Mad Dog 2]

Pay attention when you screw the thing back in. It is a good idea to put that brass screen back on there. If the fitting you put in there is a flare fitting , it can go in dry. Otherwise use a teflon based pipe dope.
There is a good chance that the seal around the fuel gauge is leaky.
When you do anything at all with the fuel tank of a boat, make sure that your power source is disconnected at the battery. And make sure that the tank and the fuel gauge itself are properly grounded. One static electricity spark there, can send you to kingdom come.

I found on boats and construction equipment that the screens in the tanks would clog it was better to remove them and install a good filter on the suction side of the fuel pump. Do they still put the fine screens in the bottom of the gas tanks?

 

[Cuppy420]

I found on boats and construction equipment that the screens in the tanks would clog it was better to remove them and install a good filter on the suction side of the fuel pump. Do they still put the fine screens in the bottom of the gas tanks?

No idea but I kinda doubt that