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Old December 13th, 2011, 04:39 PM   #1
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Default Kubota Tractor Help- L4150 5cyl Diesel

I went to start up our tractor a couple days ago and it would not start no matter what. It cranks over just fine, but it doesn't even attempt to fire.

I put some diesel 911 in the tank, and mixed it 50/50 in the filter cup, like it said to on the back of the jug, cause i figured there had to be ice in the system somewhere. Not really thinking about it when i took the fuel cup off i forgot to turn the valve OFF, i didn't notice it at the time but no fuel drained out. A couple days later i took it off again and again forgot to turn the valve off and this time fuel did come out of the valve. So maybe there was some ice in the lines, but now there shouldn't be any; yet it still wont start at all. I tried a little starting fluid, it runs (like shit) on that but as soon as the spray stops the engine dies right out.

Any thoughts, suggestions? My best guess is that the fuel pump/injection is bad, but i really don't know how to test it or whatever.

It's a 1990 Kubota L4150 4x4
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Old December 13th, 2011, 04:53 PM   #2
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I had the same problem with a Komatsu bulldozer, it was the transfer pump that was bad. Before spending money to make sure that was the problem... I filled the tank so it was higher than the injector pump and ran a hose to bypass the transfer pump straight to he injector pump and it ran like normal. Don't know if this a possibility for you or not. Hope it's not the injector pump.

The transfer pump was $260 for that bulldozer, IIRC.
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Old December 13th, 2011, 04:55 PM   #3
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My Dad had a simular problem. It was bacteria growing in the fuel plugging everything up. He put in some chemical that killed it and cleared it out. His tractor wasn't ran in a year also.
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Old December 13th, 2011, 05:32 PM   #4
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Starting fluid and a Kubota bad idea. Be carful glow plugs and starting fluid can be a bad combination. After you opened up filter did you bleed air from system. Kubotas can have a hard time birping air. I can't remember the 4150 specifically. Does yours have the one piece valve filter assembly if so there are two bleeder screws that you can open and let air out to there. There should be another bleeder screw on the inj pump. After these are bled if still no start you can loosen a couple of lines at injectors crank and see if you get fuel there. Be carful it will make a mess the spray can be extreme depending on how loose you loosen the lines watch eyes and open flame. These inj pumps usually don't go bad. In 6 1/2 years as mechanic on these I can only remember 1 bad pump and it was from running gas through it. Also Kubotas are very dependent on the glow plugs if they are not functioning properly they will start hard even warmer weather.
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Old December 13th, 2011, 06:58 PM   #5
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Originally Posted by Jasper_Jpr View Post
Starting fluid and a Kubota bad idea. Be carful glow plugs and starting fluid can be a bad combination. After you opened up filter did you bleed air from system. Kubotas can have a hard time birping air. I can't remember the 4150 specifically. Does yours have the one piece valve filter assembly if so there are two bleeder screws that you can open and let air out to there. There should be another bleeder screw on the inj pump. After these are bled if still no start you can loosen a couple of lines at injectors crank and see if you get fuel there. Be carful it will make a mess the spray can be extreme depending on how loose you loosen the lines watch eyes and open flame. These inj pumps usually don't go bad. In 6 1/2 years as mechanic on these I can only remember 1 bad pump and it was from running gas through it. Also Kubotas are very dependent on the glow plugs if they are not functioning properly they will start hard even warmer weather.
x2
Kinda sounds like you got air or a bad fuel pump.
I'm still troubleshooting a BX2230 NOT shutting down issue (no, it's not the relay/timer), I'd rather be dealing with your problem at this point
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Old December 13th, 2011, 08:18 PM   #6
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Originally Posted by Jasper_Jpr View Post
Starting fluid and a Kubota bad idea. Be carful glow plugs and starting fluid can be a bad combination. After you opened up filter did you bleed air from system. Kubotas can have a hard time birping air. I can't remember the 4150 specifically. Does yours have the one piece valve filter assembly if so there are two bleeder screws that you can open and let air out to there. There should be another bleeder screw on the inj pump. After these are bled if still no start you can loosen a couple of lines at injectors crank and see if you get fuel there. Be carful it will make a mess the spray can be extreme depending on how loose you loosen the lines watch eyes and open flame. These inj pumps usually don't go bad. In 6 1/2 years as mechanic on these I can only remember 1 bad pump and it was from running gas through it. Also Kubotas are very dependent on the glow plugs if they are not functioning properly they will start hard even warmer weather.
Thanks for the info

And I had did not know that about the starting fluid...although remember high school auto now i feel retarted that i didn't think about it lol. I did not know about the bleeder screws, i'm sure that's not helping the problem, would air in the system be a cause of it not starting in the first place? it sat for about 2 months without running
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Old December 13th, 2011, 09:11 PM   #7
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Never run a diesel out of gas..................
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Old December 13th, 2011, 09:26 PM   #8
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Never run a diesel out of gas..................
I would think if you put gas in a diesel, you wouldn't have a chance to run it out.

When was the last time the tractor was ran? Has it sat for a while?
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Old December 13th, 2011, 09:28 PM   #9
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Never run a diesel out of gas..................
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I would think if you put gas in a diesel, you wouldn't have a chance to run it out.
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Old December 13th, 2011, 10:15 PM   #10
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I would think if you put gas in a diesel, you wouldn't have a chance to run it out.

When was the last time the tractor was ran? Has it sat for a while?
The last time we used it was september, it sat at camp till 4/5 days ago when i tried to start it. It hasn't be ran since sept
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Old December 13th, 2011, 10:21 PM   #11
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The last time we used it was september, it sat at camp till 4/5 days ago when i tried to start it. It hasn't be ran since sept
Have you gone through the bleeding process yet to make sure there is no air in it? Have fuel filters been changed?
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Old December 13th, 2011, 10:26 PM   #12
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Have you gone through the bleeding process yet to make sure there is no air in it? Have fuel filters been changed?
Bleeding process- no

yes on the fuel filter, at least one of them has?
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Old December 13th, 2011, 11:04 PM   #13
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Kubotas are evil.
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Old December 14th, 2011, 01:20 PM   #14
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Quote:
Originally Posted by Jasper_Jpr View Post
Starting fluid and a Kubota bad idea. Be carful glow plugs and starting fluid can be a bad combination. After you opened up filter did you bleed air from system. Kubotas can have a hard time birping air. I can't remember the 4150 specifically. Does yours have the one piece valve filter assembly if so there are two bleeder screws that you can open and let air out to there. There should be another bleeder screw on the inj pump. After these are bled if still no start you can loosen a couple of lines at injectors crank and see if you get fuel there. Be carful it will make a mess the spray can be extreme depending on how loose you loosen the lines watch eyes and open flame. These inj pumps usually don't go bad. In 6 1/2 years as mechanic on these I can only remember 1 bad pump and it was from running gas through it. Also Kubotas are very dependent on the glow plugs if they are not functioning properly they will start hard even warmer weather.
How do you do the bleeding process? open each screw and crank it over?

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Kubotas are evil.
Never hand any issues with ours till now. Had it 4 years
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Old December 14th, 2011, 01:50 PM   #15
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Anything below fuel tank and up to transfer pump bleed by gravity. After transfer pump bleed by turning engine over or with a manual pump actuator lever if it has one. If you open bleed ports ahead of transfer pump and crank you will just pull in more air. I wish I could remember this tractor better been 15 yrs since I was a mechanic.
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