Gas in oil

No as the other guy told you over filling the tank will just make it come out the vent at the back, as the boat changes angles while driving it may spill out more thne usual. gas in the oil would usually be from worn rings, gas enters the chamber then runns down the cyclender walls. As for the oil leak it could be from almost anywhere. Wipe down all surfaces and change the oil. After this verify oil is at correct level, then take the boat for a ride. Check the oil level after the ride and look over all the surfaces of the engine to see if you have a leak.

Did you check your sight tube from your fuel pump? Does it have any fuel in it? I think marine fuel pumps have two diaphrams in them. If the first one ruptures, fuel will back up into the sight tube. But if both of them rupture, I believe fuel can find it's way into the crankcase and into the oil. It's been a few years since I've taken one apart but I believe this can happen. Let us know what you find. Brian

Pete, now that I looked at his post again I think you're right about the sight tube and diaphram. I overlooked the age thing. The 318 should have tipped me off. Thanks for setting me straight.

Well, I was able to take a quick look at things yesterday. I was able to clean the engine a bit with degreaser and it looks like the oil leak is from the valve cover from what I saw. Which will surely be an easy fix. As far as the gas in the oil, I have not gotten that far. I did check it again and it is strong there appears to be a lot in there. The oil was definately thin and reeked of gas. I had a quick question on the carb flooding after shutdown that racintg mentioned. I had adjusted the idle speed from 1200 down to 700 (way too high.....previous owner), the same weekend issues occurred. I did not adjust the idle mixture though because it idled excellent. Just wondering if that could cause my problems and after an oil change what can I do to make sure it does not happen again (lower mixture?) And Pete, if you get a chance if you could go in depth on the fuel pump and the right side and getting gas on the crankcase side, I don't think I quite understand. Thanks in advance for everyone's help.

Spievy, with the amount of gas you are discribing that is in your oil, I'm pretty sure it's coming from the fuel pump and not the carb.

Your fuel pump has a spring loaded diaphram that is driven by an arm actuated by the engine's camshaft. As the diaphram is driven in one direction by the arm, it draws fuel from the tank. As it relaxes under spring pressure the diaphram pushes the fuel through the line and into the carb. If the diaphram developes a crack (which it will over time), fuel will leak past the diaphram and into your crankcase right past where the arm is located.

Sounds like it's time for a new fuel pump and an oil change. Hope this helps! Brian

Well from the info that you both sent over that would be a lot better than having to remove the engine to replace the rings, at least immediately. I do have a small oil leak but that can wait. I should be able to repair the head cover gaskets while in the boat. Concerning the fuel pump I am guessing or rather hoping Skidim would carry that pump. Also on the carb, it is a Carter AFB. It also needs a new gasket. I have some vacuum issues surrounding it's mounting area. I have heard two stories on Carter's one stating they are junk and to replace with a Holley. I also have heard they are long lasting too though. I really have not had any real issues though thus far.....coughing a few times but I assume that is normal it is 40 years old. I did some cleaning and it seems to have cured a lot of that anyways. I will pull the pump and see what I come up with. I already took a look and it looks really old so I am hoping that a new one cures the problem. Any suggestions on something different to obtain the second diaphram if you feel it would help??

Thanks Pete, that sounds easier than what I anticipated.