"Oil" in smaller aft (below prop shaft) bildge

Bill Roosa · Jun 14, 2015

Gremlin pee?
Seriously you have checked everything I can think of. Perhaps a spill of some sort. do you keep any cans of stuff down there?
Clean her up, and keep checking to see where it is coming from, don't forget to check over head/deck as it could be running down from somewhere higher up.

jlp0217 · Jun 16, 2015

Could be a leak in the fill or vent hose or fuel sensor mount or elsewhere in/around the tank that is level sensitive. Fill fuel tank and then check again.

Mark48 · Jun 17, 2015

Following JLPs advise once the tank is full you may need to heel the boat to ensure fuel is getting to a point experienced doing the race. At least it is a good excuse to leave the dock. Also suggest you draw chalk lines where ever possible to help locate a potential leak.

DStegs49 · Jun 22, 2015

Guan, I think when you mentioned racing the boat, you were indicating that you were revving the engine? Although that might be a good idea, to put the boat into the conditions that might have caused the leak in the first place. Running the engine in seas similar to when the leak occurred. As Mark said, it's also a good reason to leave the dock. I have a similar problem with our Yanmar 3HM35F in our Legend 37. Only mine was a pink puddle. If yours is yellow or some offshoot of that, it could be diesel and you could be using fuel from a gas station or truck stop or your marina is using the on road blend for marine engines. Marine diesel in our area is died pink as to indicate off road usage only. The yellow or golden stuff is for car and truck usage because it is subject to a different tax. I think the additives are different in the marine environment also. You can mix for the boat but never use the pink in a car or truck because the tax po po get really excited when they catch you. Back the pink piddle, oops, puddle. I spent an hour or so on the sole of the head looking into my engine compartment and finally found that the fuel feed pump was leaking just a minute amount. Nothing noticeable until it was running at about 2k under power. Then the pink puddle would show up in the aft "mini" bilge. Probably not more than a tsp or tbs but when it flows it looks like a lot. I traced the moisture down a few hoses that were in contact with each other and then to the engine mount and stringer to the bilge. At least I found the source. One good thing is that diesel will NOT explode like gas will. It will burn but the flash point is much higher than gas and if everything keeps dripping down, it won't come in contact with anything hot. Now the difficult thing is finding a rebuild kit for the Fuel Feed Pump. (Anyone know where I can find one?) But that is my problem not yours. Good luck with your problem and it could be a gremlin after all!!!