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Old 01-15-2020, 02:59 PM   #1
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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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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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Old 03-06-2020, 08:09 PM   #5
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It sounds like the stop relay or the solenoid is bad. There’s a small 1.5” square brown relay responsible for shutting down the solenoid. The relay is cheaper of the two so test that first. Look on the starboard side of the engine near the on-engine fuel filter. You will likely see a couple of cable ties securing it in place. There’s an easy way to test if it’s the relay. The next time the engine won’t shut down from the helm, you can manually operate the solenoid by squeeze the rubber boot for a few seconds. The engine should shut right down. If that doesn’t work, it’s the solenoid. Could be both but more likely one or the other.
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Old 03-07-2020, 07:58 PM   #6
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I was having the same issue on my 4jhte. Mine ended up being the plug connector to the shut off solenoid, located on the injection pump.

The plug is located under the oil dipstick and according to BoatDiesel.com, it seems to be a common problem of oil dripping into the connector, causing a poor connection.

I disconnected the plug, sprayed it with Corrosion Block, cleaned it best I could and that fixed my issue. Not sure if it’s the same setup on yours.
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Old 03-10-2020, 10:12 AM   #7
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The 6LP has the stop solenoid in the injection pump and it needs 12vdc to run. you can put a meter on the plug and see what is happening.

I had that issue, power did drop off on shut off of key yet still ran, sometimes after a few minutes it would shut down and this only happened when the engine was hot, if start cold it would shut right off. I changed fuel back to Valvtec and the problem went away. So there must be something sticking.
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Old 03-10-2020, 11:36 AM   #8
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Thanks for all the input so far, I had the chance a few weeks ago to do a bit of trouble shooting and found this.

Power to the solenoid is obviously there as the engine starts and runs fine. When I disconnect the plug to the solenoid the engine stops so I thought it was the switch at the helm. Pulled the switch and checked it with a meter and everything checked out ok.

Now I’m not sure where to look, is there another relay between the helm switch and the solenoid? The same thing happens when using the shutoff switch on the upper helm as well so there must be something in between that I’m missing.

I will keep looking as I have time (currently working out of town). Thanks again

Rob
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Old 03-10-2020, 11:40 AM   #9
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I believe there is a relay, just not sure which one ( a few on the back of the inner cooler), I don't have my manual handy otherwise I'd look it up.
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Old 03-10-2020, 11:59 AM   #10
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My 4LH had a square black relay. The prongs on the relay needed to be cleaned yearly. The relays and wire harness seem to be added after the fact. I have found them in various locations on other Yanmars. Usually held on with wire ties. Start at the stop solenoid and follow the harness back.
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Old 03-15-2020, 07:45 PM   #11
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How about this- The 6LP stop solenoid is open (energized) to run. As you say- you shut off the power it kills the engine. How about pulling off the connector at your 3 way switch and see if it stops the engine? If it does the problem is that 3 way switch?
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Old 03-15-2020, 09:11 PM   #12
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How about this- The 6LP stop solenoid is open (energized) to run. As you say- you shut off the power it kills the engine. How about pulling off the connector at your 3 way switch and see if it stops the engine? If it does the problem is that 3 way switch?

Ok thanks for the tip, I will give it a try but if there is a relay between the switch and the solenoid and the relay is faulty then this wonít confirm the switch is bag or good. Still worth a try though

Rob
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Old 03-15-2020, 10:22 PM   #13
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On my Yanmar 6LYA, the secondary circuit of the fuel shut off relay is not energized in "run". The secondary relay circuit is energized by the Stop switch, and is energized as long as the Stop switch is held. The relay primary circuit feeds the fuel shut off solenoid. My fuel shut off solenoid appears to have been replaced by TPO. I've had to replace the relay twice.
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Old 03-15-2020, 10:38 PM   #14
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On my Yanmar 6LYA, the secondary circuit of the fuel shut off relay is not energized in "run". The secondary relay circuit is energized by the Stop switch, and is energized as long as the Stop switch is held. The relay primary circuit feeds the fuel shut off solenoid. My fuel shut off solenoid appears to have been replaced by TPO. I've had to replace the relay twice.
I am trying to find the relay, the solenoid seems to be functioning fine. With the engine running I can shut it down locally at the engine by pulling the plug leading to the solenoid (killing power). There must be a relay that both the upper and lower bridge switches connect to but I can’t seem to find it at the moment.

Rob
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Old 03-16-2020, 08:20 AM   #15
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LongJohn- this is a 6LP.
DiverRob- wiring diagram attached for a "C" type panel
Attached Files
File Type: pdf C panel.pdf (144.4 KB, 50 views)
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Old 03-16-2020, 09:35 AM   #16
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6LP is not like the 6LY or 4JH. LP solenoid is screwed into the inj pump and is energize to run. LY and JH solenoid is external to pump and is energize to stop.

To find out if it is a sticky solenoid, get someone to hit stop button/switch/whatever and see if volts vanish from solenoid terminal. I don't think there is a relay involved like there is on the LY and JH (from current pull consideration). Could be wrong, though.
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Old 03-16-2020, 09:43 AM   #17
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6LP is not like the 6LY or 4JH. LP solenoid is screwed into the inj pump and is energize to run. LY and JH solenoid is external to pump and is energize to stop.

To find out if it is a sticky solenoid, get someone to hit stop button/switch/whatever and see if volts vanish from solenoid terminal. I don't think there is a relay involved like there is on the LY and JH (from current pull consideration). Could be wrong, though.
I will give that a try but when i cut power from the breaker panel or pul the plug locally at the solenoid it stops immediately every time. I will put a meter on it though and see what happens. The thing is that both the upper and lower helm are reacting exactly the same. That is why I was thinking there was a relay between the solenoid and the helm switches.
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Old 03-16-2020, 06:39 PM   #18
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Part # for that relay is 119773-91850...looks like any other cube relay but I can't find the location.
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Old 03-16-2020, 07:34 PM   #19
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Part # for that relay is 119773-91850...looks like any other cube relay but I can't find the location.
Thatís very helpful, thanks at least I kinda know whet Iím looking for now
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Old 03-17-2020, 07:26 PM   #20
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Part # for that relay is 119773-91850...looks like any other cube relay but I can't find the location.
Ok found the relay and there was quite a bit of corrosion around most of the terminals. I cleaned them up but no joy so I will try and source a new one and see if that’s the issue. Thanks again for your help.

Rob
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