I looked this tractor up on tractor data. It has a common rail fuel system, an EGR valve, which means it has a variable vane turbo, and an ECM. The EGR has to close when under a load or acceleration. When this happens the variable vanes shift to keep the 'boost' at the correct amount. There has to be a boost sensor, an EGR position sensor, intake air temp sensor, and a few others. All of these sensors tell the ECM how much fuel to send to the injectors. If the EGR is out of position, the variable vanes could be out of position. If the boost sensor is stuck, in range, at a low reading, it could cause the ECM to think there is no load on the engine when actually there is, and The ECM will not send enough fuel to the injectors. When it is hooked to the dyno, these parameters need to be watched to find the problem. I really,really doubt it was your fuel supply. Mark.
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