yanmar YSE8 Fuel problem - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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Old 05-30-2013
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yanmar YSE8 Fuel problem

Ok, I changed the injector before winter.
I just changed the fuel filters, I have flow in all fuel lines.
Just took apart the fuel pump and cleaned it, put it all back together and I still don't have fuel squirting out of the pump...
The only piece of the system that I didn't take apart is the unit that is in between the big fuel filter monted on the boat and the small fuel filter mounted on the motor.
And what is that thing anyway?
It has two wires coming out of it, the supply line is attached to the back of it and the fuel line that goes to the small filter is attached to the front of it, right next to where the wires come out.

I'll try to post some pictures.
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Old 05-30-2013
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Re: yanmar YSE8 Fuel problem









Last edited by Adele-H; 05-30-2013 at 09:59 PM.
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Old 05-30-2013
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Re: yanmar YSE8 Fuel problem

It would appear to be an electric fuel pump... I'd expect to hear it clicking if it's working. Are you getting voltage to it? loose wire? corroded connection?

btw Photobucket.com is a less clumsy way to post pictures... although flicker might also support img code links.
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Old 05-31-2013
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Re: yanmar YSE8 Fuel problem

Any point in taking it appart?
Or does something like that just get replaced?
I have to check to voltage to it...tonight.

I couldn't get to the Photobucket page, it just kept on getting blank...
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Re: yanmar YSE8 Fuel problem

That looks like a sealed unit, no reason that any electric fuel pump wouldn't work. If the connections are not the same you might need to rearrange some hoses.

Just google '12V electric fuel pumps' and look for a match, making sure it's diesel rated...
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Re: yanmar YSE8 Fuel problem

Quote:
Originally Posted by Faster View Post
It would appear to be an electric fuel pump... I'd expect to hear it clicking if it's working. Are you getting voltage to it? loose wire? corroded connection?

btw Photobucket.com is a less clumsy way to post pictures... although flicker might also support img code links.
Can't see the pictures but if it has 2 wires coming out of it it is no doubt an electric pump. Faster is right, it should either click, or pulse. Some pumps may whir. The engine mounted pump may have an integral screen or filter in it? Also, make sure the tank is venting properly.

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Re: yanmar YSE8 Fuel problem

OK the pump was shot.
Bought a new one, took the old one out, connected the old one to the batery, nothing, took the new one, connected that to the batery and the darn thing squirted some kind of oil all over me so that works. Installed the new one on the motor and connected the wire to the original wires, when the key is on it clicks.
but...but this is driving me nuts...still no fuel in the line that goes to the injector...maybe I have something in backwards at the high presure pump...got to check on the manual if I see a diagram of the pump..
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Re: yanmar YSE8 Fuel problem

Nothing backwards...found a diagram and went and took the whole thing appart again.
The only thing that I can think of is the little link above the pump...
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Re: yanmar YSE8 Fuel problem

Has the electric pump started pumping fuel, and has it gotten all the way to the high pressure?
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Re: yanmar YSE8 Fuel problem

Yes it has.
I have fuel coming to the high pressure pump.
I am wondering if when I took that pump off, I might have turned the spindle that is on top...
I will try to take the bloody thing off again and give that spindle one turn (loosen) then put the whole thing back...
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