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Old 31-03-2017, 21:12   #1
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Yanmar fuel lift pump gasket oil leak

I have a yanmar 2gm20c.....sail drive. The fuel lift pump gasket is leaking oil....?

1) is there suppose to be oil behind the lift pump?
2) do I simply remove and replace?
3)is there not supposed to be oil there?

Any help is is greatly appreciated......
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Old 31-03-2017, 22:22   #2
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Re: Yanmar fuel lift pump gasket oil leak

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Old 31-03-2017, 22:25   #3
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Re: Yanmar fuel lift pump gasket oil leak

Yes, there is oil behind the lift pump as it is open to the crankcase behind the pump.

It isn't below the static oil level but when running, there is oil behind the pump from running down the crankcase internal surface and at crankcase pressure i.e. very low pressure.
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Old 31-03-2017, 22:30   #4
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Re: Yanmar fuel lift pump gasket oil leak

Don't forget the lift pump is driven by a lobe on the cam shaft and the crankcase oil splash lubricates this lobe. A little oil will always collect at the bottom of the lift pump (internally) and this is what is weeping out in your case. A new gasket or even some gasket sealant will fix it although I prefer not to use a sealant on this gasket as it makes it harder to remove the pump in a hurry if you need to.
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Old 01-04-2017, 05:16   #5
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Re: Yanmar fuel lift pump gasket oil leak

Greetings and welcome aboard the CF, Surgeknight.
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Old 01-04-2017, 05:38   #6
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Re: Yanmar fuel lift pump gasket oil leak

I use a very thin small line of sealer on the pump side of the gasket only. Pressed on carefully before reinstall, it holds the gasket in place for assembly. And when removed later leaves the block clean. An old habit from my gearhead days of yore.
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Old 01-04-2017, 09:23   #7
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Re: Yanmar fuel lift pump gasket oil leak

when removing the pump if you feel pressure pushing on the pump, rotate the engine slightly to get the pump lever off the cam, also suggest use new crush seals on the fuel lines
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Old 01-04-2017, 10:25   #8
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Re: Yanmar fuel lift pump gasket oil leak

Wow .....THANK YOU ALL VERY MUCH..... will jump on it asap....will let you know how it goes....

Super stoked to have a boat....and sail....new yo this world...but loving it so far..

Thanks again to all....
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