Tractor Repair: kubota tractor, air bubbles, suction side

Question
I have a 2004 Kubota tractor L 2500 F, the throttle will be in medium to high and then it will lose fuel pressure.  Any suggestions why it is losing fuel pressure?

Answer
What you need to do first is disconnect the return line from the engine to the fuel tank and install a clear hose run the tractor and see if you have air bubbles in that line. If you do than we need to check for fuel restriction, or a loose line on the suction side. Start there and then let me know.