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post #1 of 4 Old 08-09-2009 Thread Starter
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Fuel pump Questions

I've got a Yanmar 2GM with a mechanical fuel lift pump. It is leaking at a rate of one drop per 2 seconds. It also seems like there is diesel fuel getting in the oil. From all of the research that I have found, the pump needs to be replaced or rebuilt. Is there a kit for rebuilding this pump? I found the whole pump, but no individual parts or a kit. anyone have a parts list for the 2GM?
or would I be better off replacing the mechanical pump with an electric pump?

Also, there is a lever that moves up and down on the side of the fuel pump, what is it for? the Yanmar shop manual doesn't say anything about it.

Dave
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post #2 of 4 Old 08-09-2009
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The lever is to mechanically prime the fuel system after changing fuel filters, etc.
Most Yanmar dealers will have the rebuild kits. Getting aftermarket parts from other than the Yanmar dealer network will be slim to none.
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post #3 of 4 Old 08-09-2009
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Replace the pump. It's easy and will only take you a few minutes.

But save your old one. There may be a rebuild kit available somewhere, and if there is I'd rebuild it and put it with the rest of my spares.

You do not want to replace this pump with an electric.

That little lever is indeed a priming lever. Be aware that it ONLY pumps fuel during the last 1/4 " of travel, even though the lever travels about 2 inches or so.
Follow the manuals directions for priming and you will be fine.

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post #4 of 4 Old 08-09-2009
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Originally Posted by nereussailor View Post
I've got a Yanmar 2GM with a mechanical fuel lift pump. It is leaking at a rate of one drop per 2 seconds. It also seems like there is diesel fuel getting in the oil. From all of the research that I have found, the pump needs to be replaced or rebuilt. Is there a kit for rebuilding this pump? I found the whole pump, but no individual parts or a kit. anyone have a parts list for the 2GM?
or would I be better off replacing the mechanical pump with an electric pump?

Also, there is a lever that moves up and down on the side of the fuel pump, what is it for? the Yanmar shop manual doesn't say anything about it.

Dave
Do both... I have both the mechanical and electrical (add-on - google my sailnet + name on it) Diesel is different from gas in the requirements of no air leakage.. and 90 % of the issues one has is from bleeding...

-- Jody

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