Zetor 6245 run time limit

I get to the tractor and start it for the first time of the day. This problem happens no matter what time of day or season it is. (6 month going on problem) The tractor starts just fine two to three cranks and fires right up. I let it sit and warm up for a min or two depending on how cold it is. And it gets up to operating temp no problem and stays there. I can run it for 24 minutes fast slow loading unloading bales no issues when it starts to slowly but surly die over a coarse of 10-20 seconds. If I wait 5-10mins the tractor will start again but will take a lot of crank time and runs rough as a cob for a minute or two then will die again with in 10 mins and the process can or will start all over again depending on what I need to get done. To me it’s like someone has just turned the fuel off but this is where I can’t understand what the problem might be. Because I have replaced most of the fuel system over the past 6 years. I will give you a breakdown of what I have tried and parts that I have replaced.

The tractor has 2800 hrs on it
2008 I replaced the injectors and metal lines alone with the rubber lines
2009 I replaced the injector pump, or had it rebuilt…long story but symptoms are not the same not as what I had before.
2015 I replaced the fuel lift pump I thought that was my problem this time. I also ran it with out the fuel cap on to check to see if it was getting vapor locked.

I also do regular matinees on the fuel system change the filter ect. And have checked all rubber fuel lines for cracks and leaks and none to been found.

If any one has had this problem before and has fixed it I would love to know what their solution is.

I have had this issue on two machines, once on a Kubota tractor and once on a Zero turn mower. Both times it was bugs in the fuel tank. One was a spider and the other was a wasp. The Kubota required a tank removal to get it cleaned out. The zero turn I was able to remove the fitting on the bottom of the tank and it flushed out.

The next time the Zetor dies, disconnect the line from the tank to the lift pump and see if you have fuel flow.

I now keep the fill nozzles on the overhead fuel tanks capped.

I have a Long 900 same as the Zetor 8011 That when I got it I had to work on the fuel system. I had the same problem your having and found several things wrong. The shut off valve under the fuel tank has a strainer in it and it was very dirty as well as the tube going into the fuel tank, I got them good and clean with a good fuel flow. Also need to check the foot and hand throttle linkage at the pump to make sure it working right. Now for several good questions. Have you replaced the fuel filters? When you replaced the metal lines with rubber lines did you us gas fuel line or did you use the new diesel fuel rubber lines? The new diesel fuel will make gas fuel line turn soft and will cause them to collapse with suction on them. If nothing else take all the fuels lines off and blow air through them to make sure they are not blocked and clear. Just some things to check and try. Let us know if any of these help or not so we can help you try to figure it out. Bandit

What everybody else said plus make sure the vent hole in the fuel cap is open. Had that happen to me once.

You are sucking air from the fuel tank. If this happens when the tank is half filled or
less the tank pickup somehow gets a "breath" when the fuel is moving around in the tank.
You can confirm this by cracking the bleeder bolt on top of the filters and pumping the
primer pump and watching for air to exit. It'll take quite a few pumps to get the air
out but then it should start right up. Next top off the tank and tractor should run fine
from then on for the day. You'll need to drop the tank and repair/reposition the pickup
tube or keep the tractor tank filled. This happened to my 5245 and I opted for now to
keep the tank above half full.