I everybody,I have a 1989 7.4 mercruiser.The boat had sat for 4 to 5 years.I had new carb installed new oil and filters including water seperator filter.The boat ran find on land.We put it the water last weekend and was idling around and it loaded up and died.when i got it to start again it back fired and fuel & oil mix came out of the hose from the valve covers.Can a fuel pump fill the crankcase up with fuel?I pulled the fuel pump off and took it apart and the rubber looks bad ? Can any body give me any ideas if this is the right direction?Also the engines compression is 165 average per cylinder.
