4120 engine surging and then stalling

[tinsnip]

Greetings! Hope the weather where you are is as pleasant as it is here today.

Yesterday, after using my York rake for about an hour, I shut the 4120 down and filled it with diesel then went in for lunch. When I returned and started the tractor, it ran fine for about 15 minutes then began to surge. The tach would ramp up to 2500 and then down to 1500 while the throttle lever was set at about 1900. When I put the throttle lever all the way down, it would stall. I restarted and limped it back to the shed where it sat overnight. This morning, I bled the fuel filter and it started and ran for about an hour. I thought I'd solved the problem so at that point I parked it and shut it down. 30 minutes later, I started it up and the same problem occurred.

Is it possible the diesel is bad or dirty? What other components should I check?

As always, I appreciate your helpful replies.

Thanks!
Tim

 

[dusty3030]

Reverser or E Hydro.

 

[tinsnip]

Reverser or E Hydro.

E Hydro.

 

[dusty3030]

Ok could be load match / electronic issue and not fuel related at all

 

[aginn]

Sounds like water in the fuel filter to me. I'd replace the filter before you get too carried away.

 

[dusty3030]

Sounds like water in the fuel filter to me. I'd replace the filter before you get too carried away.

Is there any water in the bottom of the separator when you drain it. Does any water drain out or fuel or combination of both.

 

[tinsnip]

No water in the fuel when draining the filter. I started and ran it for about 45 minutes before symptoms re-occurred. Could heat be a factor? It will run strong and steady and then all of a sudden start to sound odd (like running on only one cylinder) and then range all over the place, racing then slowing down, etc. I was hoping it was as simple as bad fuel, but I don't understand how it could run so well for the first 45 minutes if that were the case.

Thanks for your ideas.

 

[dusty3030]

For giggles run it with the fuel cap loose I think ours has a vented cap correct?

 

[tinsnip]

I'll try that in the morning. I'd love it to be something simple.

Thanks!
Tim

 

[tinsnip]

I've run it for about 45 minutes without he problem re-appearing. Plan to run some more today.