I've solved this problem. It just happened to me. The one thing nobody checked was the O Ring on the fuel shutoff valve above the filter. Took mine off, soaked it in brake fluid for a hour, the tractor runs beautiful, does not cut out at all. Hope this helps anybody else out there with the same problem.
Yanmar loses power, slows down & kills
- Thread starter tallyho8
- Start date
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irwin
Veteran Member
After losing a re-election bid the tractor took it easy for a while before resorting to murder.
irwin
Veteran Member
Welcome to TBN jtshine, good to have you here. Thanks for posting your fix.
OP
tallyho8
Elite Member
- Joined
- Aug 1, 2004
- Messages
- 4,531
- Tractor
- Kubota L4400, Kubota ZD326
I wish that my original problem could have been solved so easily! As mentioned in earlier threads, I even used a fuel can and ran the line straight to the injector pump, eliminating the fuel filters, tanks, lines etc. and the tractor did the same thing.
But since I rigged up my air-line on it, I have had no problems whatsoever, and still love using my Yanmar for all the small and odd jobs around here.
But since I rigged up my air-line on it, I have had no problems whatsoever, and still love using my Yanmar for all the small and odd jobs around here.
Ron D.
Silver Member
- Joined
- Apr 23, 2009
- Messages
- 110
- Location
- Collin Co. Texas
- Tractor
- 2003 Kubota L2600DT, F13D Yanmar, Sears garden tractor with MMM, older JD Garden Tractor with MMM, Gravely commercial ZTM
This site really rocks. I have a F13D that I was using yesterday and it all of a sudden started losing power and died. I looked around the fuel components and saw the fuel bowl was full, so I felt it wasn't a supply issue to that point. I noticed that between the first and second cylinder injectors that a rubber line that ran on top of the injectors appeared to have diesel around it and it was such that I could move the line easily on the fittings.
I came in the house and went to TBN and went to the Yanmar discussion page, and what to my surprise was a 17 page thread of "Yanmar loses power, slows and dies". Exactly what mine was doing with the exception that mine wouldn't stay running. After reading the 17 page of tallyho8's problems and related suggestions, I had a pretty good idea of how the fuel system worked. I learned that the top lines were return lines, and if the system sucked air anywhere that it would stop running. Based on what I read, I determined that the problem was probably air coming in where the line was loose. So I removed the line for inspection, found cracks and repalced it. Started up immediately and sounds as good as ever.
I will replace all the lines when I get done with my immediate projects, but want to thank everyone who spends their time assisting others here. I know that the informative posts take a lot of thought and time, anyway, "thumbs up" to all.
I came in the house and went to TBN and went to the Yanmar discussion page, and what to my surprise was a 17 page thread of "Yanmar loses power, slows and dies". Exactly what mine was doing with the exception that mine wouldn't stay running. After reading the 17 page of tallyho8's problems and related suggestions, I had a pretty good idea of how the fuel system worked. I learned that the top lines were return lines, and if the system sucked air anywhere that it would stop running. Based on what I read, I determined that the problem was probably air coming in where the line was loose. So I removed the line for inspection, found cracks and repalced it. Started up immediately and sounds as good as ever.
I will replace all the lines when I get done with my immediate projects, but want to thank everyone who spends their time assisting others here. I know that the informative posts take a lot of thought and time, anyway, "thumbs up" to all.
TallyHo8, I have a John Deere 750 with a Yanmar diesel doing the same thing. I really liked your idea of putting in clear lines to try and track the fuel. I put in some plastic line but now can't get the tractor to start. I bled the lines clear to the injectors and still no luck. I have read that there is a certain amount of pressure needed to mist the fuel into the injectors and my thought is I'm not getting enough pressure through these lines to start. TallyHo8 did you have this issue and how did you get around it? Could this mean my injector pump is bad?? Been fighting this issue for 3 years and also took to shop. Thanks for any help!
HoyeTractor
Gold Member, Approved Advertiser
The clear hose will only work between the tank and the pump. It is hard to tell from your post where you used the clear hose but if it is between the injectors and the pump it will not work. Those have to be very rigid steel. There will be over 4,000psi in those lines and any flexing will act like air and prevent the injectors from spraying.
clemsonfor
Super Member
Yea Aaron, I was thinking get the same thing. You can't put plastic or rubber or whatever after the pump??
Dieselbird
New member
- Joined
- Mar 9, 2019
- Messages
- 1
- Tractor
- JD 1050, MF135, 8N
Hey Guys, don't know if yall are still active on the forum but my account was finally activated so I can add my thoughts on this problem.
I have a john deere 1050 that has basically the same engine and fuel system as the OP's tractor and I have dealt with this same problem on and off since I got the thing in 2014. For years I thought it was the injectors or pump and about a year ago I took all that apart and cleaned them thoroughly and it seemed to help but it didn't last. I had found improvements by adding 2 stroke oil or peanut oil to my fuel. I noticed that it would only give me trouble on some tanks of fuel. I have ordered the fittings and clear fuel hose to add the OP's fix with the tees to allow the bubbles to go up to the tank return so that should fix it for good... However, I think I know where the bubbles are coming from.
My original idea was the fuel boiling in the injector lines, I tuned up my cooling system and it made the tractor run longer before having trouble. At this point I wondered if the bubbles were caused by crankcase pressure buildup leaking in somewhere on the back of the injector pump into the gravity pressure fuel supply. I plugged the crankcase vent and it didn't affect anything. Then I found this thread. I found that my tractor was indeed getting bubbles in the fuel line like the OP described. This is when I came to my current conclusion. I think that there is water or some other contaminant absorbed into the fuel and when the inside of the crankcase exceeds it's boiling point and heats the injector pump assembly I think that this contaminant is boiling out of the diesel fuel and creating the bubbles. I think this explains why I only have the issue on some fill ups.
I suppose this is the downfall of gravity feed returnless fuel systems.
Someone a long time ago in the thread suggested the fuel boiling but the idea was quickly shot down on the fact that the boiling point of diesel is "much higher than gasoline" I feel like it's definitely some other substance being carried along with the fuel that is boiling out.
Anyway, 10 years later but maybe someone who is having this problem will see this and it will help them understand.
I have a john deere 1050 that has basically the same engine and fuel system as the OP's tractor and I have dealt with this same problem on and off since I got the thing in 2014. For years I thought it was the injectors or pump and about a year ago I took all that apart and cleaned them thoroughly and it seemed to help but it didn't last. I had found improvements by adding 2 stroke oil or peanut oil to my fuel. I noticed that it would only give me trouble on some tanks of fuel. I have ordered the fittings and clear fuel hose to add the OP's fix with the tees to allow the bubbles to go up to the tank return so that should fix it for good... However, I think I know where the bubbles are coming from.
My original idea was the fuel boiling in the injector lines, I tuned up my cooling system and it made the tractor run longer before having trouble. At this point I wondered if the bubbles were caused by crankcase pressure buildup leaking in somewhere on the back of the injector pump into the gravity pressure fuel supply. I plugged the crankcase vent and it didn't affect anything. Then I found this thread. I found that my tractor was indeed getting bubbles in the fuel line like the OP described. This is when I came to my current conclusion. I think that there is water or some other contaminant absorbed into the fuel and when the inside of the crankcase exceeds it's boiling point and heats the injector pump assembly I think that this contaminant is boiling out of the diesel fuel and creating the bubbles. I think this explains why I only have the issue on some fill ups.
I suppose this is the downfall of gravity feed returnless fuel systems.
Someone a long time ago in the thread suggested the fuel boiling but the idea was quickly shot down on the fact that the boiling point of diesel is "much higher than gasoline" I feel like it's definitely some other substance being carried along with the fuel that is boiling out.
Anyway, 10 years later but maybe someone who is having this problem will see this and it will help them understand.
