Re: Yanmar no start.

Mark Erdos



Sounds like you have it narrowed to a fuel issue.


Check your diesel fuel tank air vent to ensure it is not clogged or obstructed.


Does the start/generator run okay with no load?


Do you have duel racor filters? If so, is there a vacuum when the engine is running? And, have you tried switching to the alternate filter?

Image result for dual racor filters



With best regards,





Sailing Vessel - Cream Puff - SM2K - #275

Currently cruising - Tahiti, French Polynesia


From: [] On Behalf Of Dan Carlson
Sent: Wednesday, February 3, 2021 11:34 AM
Subject: Re: [AmelYachtOwners] Yanmar no start.


Thanks for the tips Bill and Steve,


I tried to trouble shoot the solenoid by having Lori actuate the stop button on the console while I monitored for the clicking down at the engine.  That sounded normal. I tried to start and again it cranked but did not catch.  But it sounded like it was just getting some combustion at the end, so one more try and it slowly caught and when I gave it some slight throttle in neutral it picked up. I ran it for 15  minutes at 1700 rpm to get to temperature. It had a little bit of load from the alternator, charging the Li batteries. After it reached temp I switched the alternator regulator to "float"/ no load, ran the rpms slowly up to 2500 and back down to 1000 rpm. After a minute there I put the throttle back to the idle position and the rpms decreased to about 500 and then the engine stopped. So it seems like I have a low rpm idle setting or fuel flow issue at idle. I think I can adjust the idle up slightly, but that doesn't account for the change in performance of the engine, both the unexpected stopping as well as the difficult starting. (I've never had to apply any throttle when starting in the past.)


Steve, I'm not sure if I can test that small of a change in the fuel pump performance on the boat. 


Also, the fuel injectors were rebuilt and the valves adjusted a a little less than two hundred hours ago. 


Does that trigger any more ideas? 


Thanks and regards, Daniel Carlson on sv BeBe, SM #387.



On Wed, Feb 3, 2021, 4:23 PM CW Bill Rouse <brouse@...> wrote:

My 8 Ball Crystal Ball says, "Check Back Later"😀


I wonder if the fuel flow stop solenoid or the stop button is not working and cutting off fuel?





CW Bill Rouse Amel Owners Yacht School

Address: 720 Winnie, Galveston Island, Texas 77550 


View My Training Calendar



On Wed, Feb 3, 2021 at 1:03 PM Dan Carlson <carlsdan61@...> wrote:

Hello Yanmar diesel gurus.


Our Yanmar 4Jh3-HTE has never missed a beat, until today.


Engine started fine and operated for 30-40 mins to lift anchor exit anchorage and get underway. Mostly at 1200-1500rpm.  Normal shutdown, with a short rev to approx 2500rmp before return to idle for a minute or two then shutdown.  Temp and oil pressure all normal.


After approx 1 hr sail to next anchorage engine started fine and operated at approx 1500 rpm for 15 minutes into anchorage then idling while anchoring for approx 5 mins, 1200-1300rpm to back down anchor, then after a short idle another rev to approx 2800 rpm then return to idle. When the engine rpms returned to idle the engine just stopped.  After thinking through everything that just happened I attempted to restart the engine and it did not catch after approx 3-5 seconds of cranking.  


We had lunch and allowed the engine to cool for a little over an hour. I checked coolent level, oil level, fuel in racor, looked over the engine and then attempted to start with no luck.  Next I pumped the fuel priming pump on top of the filter a few times but I did not bleed any fuel out.  I attempted to start two more times with approximately 5 seconds of cranking each time with no success. No indication of any firing. 


Finally: I drained about 1/4 cup of clean fuel from the bottom of the fuel filter, then loosened the fuel bleed valve and pumped some more fuel out of the bleed valve. It did not appear that there was any noticable air in the system.  Cleaned up and retried with Lori cranking for 5 seconds while I pumped the priming pump. No success.


Fuel tank has over 500 liters.


I thought I'd  check in with other Amel owners to get inputs on the next steps for troubleshooting. 


Advice appreciated.


Thanks and regards, Daniel Carlson on sv BeBe, SM #387


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