Gas in the crankcase

[al murch]

1st. 1978 Mercruiser(260) inboard(PenYann)4barrell Rodchester Quad(Marine)<br />Problem = Last year gasoline entered the crankcase, by the time I realized it I had 50/50 Gas/oil. = Change oil,and filter, Rebuild the Carb. Not sure but the problem seems to be comming back. I have a electric fuel pump running at 4-7 lbs.And when the engine is shut off the fuel pressure is "0" The engine runs fine idles @500 rpms. <br /> Any thoughts

 

[flashback]

Re: Gas in the crankcase

hey jojo, don't know if this will help much but is the electric pump the only one? I have a 79 Chriscraft scorpion and it has a mechanical pump on it. with the mechanical pump, if the diaphram goes bad you can get gas in the crankcase. not a good thing. I carry a spare all the time.

 

[al murch]

Re: Gas in the crankcase

I have a block mounted diaphram pump but it's not in use. The person I bought the boat from said he could not keep a diaphram pump in it, and the cost was steep. so he went electric.