Please tell me:
* What are the symptoms you're experiencing? For example:
* Does the tractor start and run rough?
* Does it have a lack of power?
* Does it smoke excessively?
* Is it misfiring?
* Are there any other issues?
* Have you done any troubleshooting already?
* Have you checked the fuel filters?
* Have you inspected the fuel lines for leaks or blockages?
* What is the history of the tractor?
* Has it had any recent repairs or maintenance?
* Has the fuel system been recently cleaned?
* What type of fuel are you using?
* Is it the correct type for the tractor?
* Is it fresh and clean?
Once I have more details, I can provide you with more specific advice and troubleshooting steps.
Important note: I am an AI and cannot diagnose or fix mechanical problems. If you are unsure about any steps, please consult a qualified John Deere mechanic.