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Have a 2011 Kubota L3800 that has only 90 hours. Went and started it up today, it ran for about two minutes and died. Any ideas?

Acted like I turned the key off or the seat kill switch turned it off. Not that and has plenty of fuel. Don't know where to start looking I am not a mechanic.

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  • Kubota Expert
  • 187 Answers

Tracking down fuel problems.

  1. Make sure there is plenty of fresh fuel in tank. High Octane less than one month old. Water in the fuel system will often cause hard starting, low power, backfiring, surging or stalling
  2. Is there a cut off valve at the gas tank?If so check that it is open or working if it is electric.
  3. This step comes from repeated personal experience with JD gas tanks. Remove fuel line from filter and remove the filter, gas should pour out of the hose coming from the tank. (look at the filter before removing it, it should look at least 1/2 full of fuel.) If gas does not pour out remove gas tank cap. If fuel flows now, you need to unclog the cap vent or replace the cap. The vent is that tinnnny little hole in the center of the cap. If the fuel still does not flow then blow air from the filter end of the hose back up through fuel line to blow out any blockage inside the gas tank.

    Do your self a favor, leave the gas cap off and turn the outlet air on your compressor down below 20 psi. If the tank is nearly full you will blow gas out of the tank.Do this outside if possible; at the very least you need a well ventilated area. After blowing air from the air filter back to the tank, you may have to reverse the process and pressurize the tank to get the fuel started.I place my hand over the open tank and hold the air hose between the joint of my thumb and forefinger to seal the tank, and then squeeze the trigger.Once you have a good fuel flow out the line to the filter, put on a FRESH FILTER. Try cranking the engine. If it still does not start move on to the fuel pump and carburetor
  4. Check the fuel pump.The fuel pump system on the twin Koehler and the Twin Briggs (and others) are almost identical. Watch this excellent, eight minute, video to learn how to check the fuel system, including the pump, up to the carburetor. . https://www.youtube.com/watch?v=HAUZUPoopSI
  5. Note: My engine was starting hard and dying in the field this year (March 2015).While doing a valve adjustment, I found a hairline crack in the bend of the vacuum hose powering the fuel pump.It's the short hose running from the valve cover to the fuel pump. The fuel pump will not work if this hose is cracked.
  6. Many systems have a fuel shut off solenoid. This is a small cylinder on the bottom of the carburetor. It has two wires running to it. It should make an audible click when you turn the key on. If it does not click you will have to replace it or track down an electrical problem.
  7. If this has not solved the problem you may have to remove and disassemble, clean, or rebuild the carburetor at this point.You may have water, dried fuel (varnish) or trash in the carburetor bowl.Before removing and disassembling the carburetor try draining the bowl.Or, take the bowl off, careful not to drop the small parts inside.Clean the bowl and replace.I often remove the bowl on small engines and save the hassle of a complete carb removal.

NOTE: Connect a volt meter across the two battery posts. If battery voltage drops below 9 volts when cranking or while the engine is running, the fuel cut off solenoid will not function. That means the engine will not start or will die soon after starting. So check your battery voltage before, during, and after cranking. If the battery voltage is good before but drops below 9 volts while cranking this is generally a sign the battery has one or more bad cells. Replace the battery. If the battery is in fact good, and the voltage is still dropping, you may have a bad starter motor which is drawing too much amperage.
If you find this fuel checkup does not solve the problem, repost your question with updated info and I will walk you through the next step.Tracking down a spark problem; yes, your problem could involve the coil. (Not as likely as fuel)
Small Engine Repair Checking Vacuum Fuel Pump Fuel System on Kohler Twin...

Posted on Apr 07, 2015

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SOURCE: Craftsman riding mower, 21hp B&S starts and dies

Try removing fuel bowl under carb and cleaning it. Junk and condensation can collect there. I had same problem. Did that and problem fixed.

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SOURCE: Started up...then died as if safety switch 18HP craftsman rider

On later models there are possibly three safety switches, one under the seat, one for the blade engage mechanism or blade clutch so the blades don't turn when the mower is started, and a neutral safety switch to make sure the mower is in neutral before it starts.

Posted on Jul 07, 2009

GM Elec
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SOURCE: difficult to start -- bad kill switch?

You have 3 safety switches located on the tractor, any one of which can cause the tractor to not crank over.
I assume the deck lever is not engaged, you are sitting in the seat and you push the clutch down when trying to start?
Start by lifting the seat and disconnecting the seat switch, push the clutch in and try to start.
Start there and we'll go from there.
Regards,

Posted on Aug 21, 2009

mickey813
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SOURCE: Kubota Z18 zero turn mower won't start.

souns like the key swich is bad ck that

Posted on Oct 01, 2009

SOURCE: Hi, my ST 30 Kubota

http://www.orangetractortalks.com/2008/09/kubota-parts-service-and-operators-manuals/
http://www.ssbtractor.com/kubota_tractor_manuals.html
Hi, if it blew black smoke overreved and then was stopped suddenly, most likely then you have broken one or more "Rings" i would expect.
To do anything with these units, one simply must obtain a shop or service manual, one cannot service nor repair without the reference contained in the manual, not to mention the parts numbers, needed to obtain spare parts too.
Also inside these manuals, ate all the relevant troubleshooting steps that you need to take to isolate and then repair your problem.
The first thing to check, is the throttle make sure it is working OK, it may simply have been stuck, and simply need, lube, & a few good opening and closing of the throttle a number of times, then try starting up again, a little high revving and black smoke, can be Ok if just in the initial startup.... but if it is throttle jammed wide open, well then no.. however sometimes a motor will cough up black smoke for a bit, as it starts, it sort of "Clears it's throat" so to speak.. this may/should settle down once it all warms up... but generally as related, it means that the Oil is able to get by the rings, and up into the combustion chamber, and hence the black smoke, usually indicating worn, or broken rings.. which need to be checked.

home.howstuffworks.com > ... > Home Repair
www.briggsandstratton.com/
www.freeengineinfo.com/.../small-engine-repair
Above are three DIY self help small motor repair for your info i am sure they will all help.

Posted on Nov 13, 2010

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