If you know nothing it's not a good idea to fool around with fuel pumps on a turbo diesel. Take it to an expert who knows what he's doing, or to a Deere agency.
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yes, the purpose of the relay is to signal the pump to turn on and off, if its not working at all the fuel pump will not turn on.
Blown fuel pump fuse, bad fuel pump relay, or the fuel pump itself has failed.
The fuel pump will still try to pump fuel even if the tank is empty.
Blockage in the fuel line, remove the fuel line at the fuel pump, and use compressed air to blow thru the line from the feed to the fuel filter, if it blows thru then you dont have a blockage, make sure your fuel pump is coming on when you turn on the key, if not check to see if you have 12 volts at the pump when you turn the key on, if not check the fuel pump relay, if you do have 12 volts at the pump when you turn the key on, check the connections on the fuel pump or replace the fuel pump with a new one. make sure to disconnect the battery before removing the fuel pump.
12 volts.
Unscrew the fuel caps, insert the nozzle from the fuel pump, turn on the fuel pump.
The computer grounds the fuel pump relay which in turn sends power to the fuel pump.
Blown fuse, defective fuel pump relay, or the fuel pump itself is bad.
The fuel pump relay switch looks like the normal electric switch. The function of fuel pump relay switch is turn the fuel pump on.
The fuel pump is in the fuel tank Turn key on-Should have a fuel pressure of 64-85 psi
being that fuel pump is in the gas tank I would remove the fuel line at the filter then turn on ignition being that fuel pump is in the gas tank I would remove the fuel line at the filter then turn on ignition