Yes...new air filter. I'll see if I can figure out thepumpguysc's recommendation. I did Google the 2.4L fuel system but didn't see any videos that explained it. My JD 4720 is a 2007 so it does have the 2.4L engine with the integrated fuel system.
Also, if anyone has specific information about the thermistor on the JD 4720 I would love to know where it is. As I mentioned earlier...I took apart the fuse box completely and the harness behind it and didn't see one.
Did you solve the problem. My tractor uses mechanical fuel pump pretty much out of ideas. Where would fuel solenoid located? Any input would be appreciated