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Old 01-15-2020, 02:59 PM   #1
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City: Victoria, BC
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Yanmar Fuel Shut off Solenoid

Hey everyone

I have a couple questions that I need help answering if you donít mind. First the engine I have in my 34í 2007 Mainship Trawler is the Yanmar 6LPA-STP. I have an issue with shutting down the engine from the ignition switch. Itís a three way switch which is normally in the run (middle) position you push up to start and down to shut off. It starts and runs fine however pushing down on the switch does nothing. The only way I can shut down the engine now is to cut power to the circuit at the breaker panel. What I want to know is if the solenoid uses power to keep the fuel open or does it use power only to shut it down. I think the solenoid must be working because the engine starts and runs perfectly fine and when I cut power it shuts down immediately so I think itís a switch/power issue. Also if anyone has a picture of where it is located exactly that would also be helpful (I have looked and think I know where it is but want to be sure). Thanks

Rob
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Old 01-15-2020, 03:54 PM   #2
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I used to have a 65HP Yanmar as a back-up wing engine. While it was set up for starting from the pilot house, the only way to shut it down was a manual (pull cord) in the engine room, presumably attached to the fuel solenoid. No idea why it was rigged this way and as a back-up it was not really an issue, but perhaps you have a similar install.
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Old 01-15-2020, 04:59 PM   #3
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Quote:
Originally Posted by Chrisjs View Post
I used to have a 65HP Yanmar as a back-up wing engine. While it was set up for starting from the pilot house, the only way to shut it down was a manual (pull cord) in the engine room, presumably attached to the fuel solenoid. No idea why it was rigged this way and as a back-up it was not really an issue, but perhaps you have a similar install.
No I donít think mine is the same, it used to shut down using the ignition switch on the console. Thanks

Rob
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Old 01-15-2020, 05:05 PM   #4
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Diverrob,


I have the same engine in my 2003 MS Pilot 30 II. The operating manual and service manual are on line. The schematic shows the valve schematically as a normally energized solenoid, de-energized by the stop switch. Unfortunately no drawings show it's physical location. I'm not at the boat, but it's got to be in the fuel line somewhere before the injection pump. Only owned this boat since October and have not had much time to learn the engine in detail. If you find it before I do - post a photo pls.


Thanks
Larry
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