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Re: Yanmar 2GM20F


 

I got some inexpensive generic fuel pump of the correct line size on
eBay when I was first troubleshooting this engine (boat was sold to
me with the diesel not running) and I'd figured out I was having
some fuel supply issue (from the lack of fuel out of the lift pump).
Worked fine and was definately faster than the Kubota's mechanical
pump, but went back to the mechanical pump after figuring out it was
working and the cause was a 2nd hidden filter between the cockpit
and the fuel tank that was clogged. But I still carry it for priming
fuel filters, testing if needed, transferring fuel if ever needed, etc.

I gave it a cigeratte lighter plug. But actually using it instead of
the mechanical one would certainly make bleeding faster tho maybe
a bit fast and messy if I'm not careful. I imagine the existing
mechanical pump would need to be removed and the hole sealed or
else given a closed loop of oil to pump so that it didn't wreck
itself and wedge.

Replacing hardened fuel lines and keeping hose clamps snug could
help prevent drawing air in to the system. I was having trouble
there too.

"All a diesel needs is fuel and engine oil" is surprisingly tricky.

-scott, #93

On 0, "JAMES DOBBS via groups.io" <jdob3542@...> wrote:
to T27Owners

I concur with your actions and assessment of the cause. I found
bleeding the injectors which is as far as the air can be trapped, is
the only proven way to get the air out, so you may want to fix the
rusted high pressure lines and connections. The Yanmar mechanical pump
has a very slow pumping rate and it takes FOREVER to get the fuel
through the engine pump, lines, governor and to the injectors. I am
trying to find a small in-line electric booster pump that will keep
positive pressure on the governor, but also allow syphoning if the pump
is turned off, similar to what is found in aviation.
I have also found that the system between the tank and engine pump can
get a vapor lock in the lines just by sitting which can lead to a
unexpected loss of power or even kill the engine....maybe old fuel
makes that more likely.
Just my experience and 2 cents.
Hope it helps

-----Original Message-----
From: Howard Fidel <howard@...>
To: [email protected]
Sent: Thu, Jul 2, 2020 8:02 am
Subject: Re: [T27Owners] Yanmar 2GM20F
We checked the filters and bled the lines. Couldn't get the injectors
due to rust. Also, I learned after the event the fuel is very old. That
probably was the root cause of the problem. We didn't have the pump to
pump it out, and since we were far from home, we decided to have the
mechanic work on it. He didnn;t get to it yesterday, but will
definitely work on it today.

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