Kubota L 3400 diesel fuel/gasoline

   / Kubota L 3400 diesel fuel/gasoline #1  

tsrohrb

New member
Joined
May 17, 2012
Messages
17
Location
Weston,WV
Tractor
Kubota L3400 HST
Well fellas I did it! I have owned my Kubota L 3400HST for 4 years and it has been a great tractor. I was doing a brush hogging job this past weekend and made a huge mistake. The kind of mistake that you expect only your neighbor, your child, or (sorry sound sexist) your wife to make.
I will start by telling you that I do not like to do tractor work for other people. I have many reasons, but mainly time. I work full time, have a child in middle school sports, help coach a pee-wee football team, and have a farm and home that are 20 minuntes apart. Not to mention the wear and tear on equipment. However, I have an uncle that has always treated me pretty well and slipped me a $20 a few times when I was a starving college student. He asked me a few times to brush hog for him and I finally agreed to do it for him. I decided to try and complete the job in a weekend. It is mostly hill side and few small flat areas. I worked all day Saturday and only had few hours left to do on Sunday. I hate to work on Sunday, but I have football each evening during the week and would have to wait until the next weekend to get the tractor moved back to the farm if I did not finish up. I got a late start on Sunday and was in a rush to get started. I checked the fluids, greased everything, topped off the fuel and went to work.
Somewhere between 30 min and 60 min later the tractor slowly powered down and the engine stopped. The tractor wanted to start but would not fire back up. I decided it had to be a fuel or air issue. I looked at the air filter and it did not look too bad and then decided to clean the fuel filter. I screwed off the fuel filter and immediately realized I had a major problem. I could smell gasoline! In my rush to get started, I stopped at a different gas station to get fuel (usually stop at sheetz) and immediately grabbed the green handle and started pumping(at 7-11). It was 87 gasoline not diesel. I know, I know---how could I make that mistake? The smell, the size of the nozzel, the cost. I don't know. I was thinking about a million different things and received a cell phone call just as I was getting out of my truck. I realized what I had done as soon as I started to screw off the fuel filter, but it was too late. I wanted to puke. I was physically ill and embarassed I had done such a stupid thing. I had convinced myself that the engine was toast. The first thing I did was go to my parents house and ask my dad (back yard mechanic) what to do. I explained the situation and he was positive, which was exactly what I needed at the time. The next think I did was search for related info here in tractorbynet. I did find a similar post that had a positive outcome and couple that were not so lucky. I skipped over the threads that were not good. We went back to the tractor and drained the tank and the lines the best we could, cleaned the fuel filter, added some diesel, cossed our fingers and turned the key. The tractor never hesitated. She purred like a kitten. Wow!! Of course there may be some damage that I cannot see, but the tractor sounds fine and runs fine so far. I am not going to run the tractor until I change oil, oil filter, and fuel filter. I think I got lucky that the fuel tank was not empty before I added the gasoline. I am guessing it was 60/40 gas to diesel.
 
   / Kubota L 3400 diesel fuel/gasoline #2  
Thanks for this post. It's a great reminder to me to slow down when stuff begins to hit the fan. Anyone who has ever done anything has had their "Doh!" moments. Here's to a lesson learned, and I hope your tractor is okay.:thumbsup:
 
   / Kubota L 3400 diesel fuel/gasoline #3  
I'm a little surprised that at a 60/40 split your engine powered down and stopped. Having had an international assignment in Europe where the majority of cars are diesel, I was the English speaking contact for all the American visitors from my base plant back in the USA. You wouldn't believe how many of them came to me sheepishly saying they had filled their rental with gasoline instead of diesel - what to do. My answer to them, learned from my European colleagues, is to keep filling with diesel frequently to keep as much diesel lubricity in the system avoiding fuel pump damage and take it easy. Nobody ever had an engine problem that resulted. My best guess as to what happened in your case is the fuels mixed from the hot diesel return line and got to the point where the mixture of gasoline and diesel was not viscous enough to build the proper injection pressure so you lost power until it died. Draining and refueling with diesel, then being able to run it and it ran like before this incident indicates no real harm done although you might have taken some life out of the injection pump. However depending on where your pump was designed and built there may have been no harm. Japanese fuel tends to be more like kerosene so their fuel pumps tend to be more tolerant of this kind of incident. This statement came from an engineer for an European pump manufacturer when we were talking about the reduction in pump life from using No. 1 diesel rather than No. 2. I asked him about my personal diesel, a Kubota. He said, "Japanese - their fuel is so low on lubricant you can run No. 1 diesel full time without hurting the pump but of course your power will be lower, your engine will run hotter, and you will have worse fuel economy". I later got to look at test data that confirmed what he said.
 
   / Kubota L 3400 diesel fuel/gasoline #4  
phew, that's a whole lot of words for an honest mistake...
anyway, guess the question is to what extent it may have damaged cyl walls/rings? don't know if injector pumps can have issues w/gas..... did it heat up before quitting? sounds like you did the right thing after the fact...
bet you're okay. get a good nite's rest, & good luck in your extravagantly described schedule.... :)
 
   / Kubota L 3400 diesel fuel/gasoline #5  
This makes me want to go out and pour gas in one of my diesels. Just to get it over with.
Knock on wood
I've been running diesels since 1978 and only twice have been involved when some soldiers put gas in a generator.
I go by the sniff test and if there is ANY doubt I leave it out.
 
   / Kubota L 3400 diesel fuel/gasoline
  • Thread Starter
#6  
Big Bubba---The tractor never got hot. I am hopeful that I don't have any major damage.
 

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