I am new here so let me say thank you in advance for taking the time to read this.
I have a Yazoo Kees ZT MAX 61" Commercial with a 25 hp Kohler Command engine. Model # ZKH61253.
History: I have had the mower for about 7 years. I ran perfectly until last year. I started blowing a lot of smoke out of the exhaust and it would run for a few minutes and then I had to pull the choke for a second or it would die. I took it to a shop and they found that the fuel pump (mechanical on top of right valve cover) was cracked and blowing smoke into the carb. They replaced the fuel pump and let it sit and burn a tank of gas out and it ran fine.
Current Issue: I can start the mower and as long as I leave it sitting still it will run all day. Once I engage the blades or start moving it will run for a minute and then try to die, here comes the weird part...if I pull the fuel line off of the outlet side of the fuel pump (fuel pump is still pumping gas out) and stick it right back on really quickly the mower will recover and run fine for a few minutes and then do it again....if I am not so fast it will die and then start right back up (with the choke out) and run fine for a few minutes. I have not been able to put any kind of pattern together...sometimes it will run fine for 15 minutes without dying and sometimes 15 seconds.
What I have tried: Draining all the gas and starting with new gas.
Replacing fuel lines.
Replacing fuel filter.
Cleaning carb.
Running gas directly to the carb from a container (gravity feed).
Removed probe from the electronic fuel solenoid (safety shut off located on back of carb).
I just can't figure out why it will run fine for a bit and then just quit. Any suggestions that I haven't already tried or do I need to perform an exorcism on it?
Thanks!
I have a Yazoo Kees ZT MAX 61" Commercial with a 25 hp Kohler Command engine. Model # ZKH61253.
History: I have had the mower for about 7 years. I ran perfectly until last year. I started blowing a lot of smoke out of the exhaust and it would run for a few minutes and then I had to pull the choke for a second or it would die. I took it to a shop and they found that the fuel pump (mechanical on top of right valve cover) was cracked and blowing smoke into the carb. They replaced the fuel pump and let it sit and burn a tank of gas out and it ran fine.
Current Issue: I can start the mower and as long as I leave it sitting still it will run all day. Once I engage the blades or start moving it will run for a minute and then try to die, here comes the weird part...if I pull the fuel line off of the outlet side of the fuel pump (fuel pump is still pumping gas out) and stick it right back on really quickly the mower will recover and run fine for a few minutes and then do it again....if I am not so fast it will die and then start right back up (with the choke out) and run fine for a few minutes. I have not been able to put any kind of pattern together...sometimes it will run fine for 15 minutes without dying and sometimes 15 seconds.
What I have tried: Draining all the gas and starting with new gas.
Replacing fuel lines.
Replacing fuel filter.
Cleaning carb.
Running gas directly to the carb from a container (gravity feed).
Removed probe from the electronic fuel solenoid (safety shut off located on back of carb).
I just can't figure out why it will run fine for a bit and then just quit. Any suggestions that I haven't already tried or do I need to perform an exorcism on it?
Thanks!