Replacing Fuel Pump On John Deere 425: Diy Guide

If you're looking to replace the fuel pump on your John Deere 425, you'll first need to locate it. The fuel pump is mounted inside the fuel tank. To access it, you'll need to remove the fender deck. Once you have located the fuel pump, you can disconnect the connector and remove it from the tank. Be sure to check the fuses under the dash as well, as a blown fuse could be the cause of a non-functioning fuel pump. When replacing the pump, be careful with the electrical wires and make sure the connections are secure. It's also recommended to replace the fuel filter and the O-ring seal at the same time.

Locating the fuel pump

To locate the fuel pump on a John Deere 425, you can refer to the assembly diagram for the model. The fuel pump is part of the fuel and air system, and its replacement part number is AM118839.

The fuel pump is located inside the fuel tank, and you can access it by removing the fuel tank cap. If you are experiencing issues with your fuel pump, it is recommended to check the wiring and clean all the connectors before replacing the pump itself.

It is important to note that, as of January 2023, the original fuel pump for the John Deere 425 is no longer available, and the current replacement part may not work correctly. You may need to source the original part number (AM115629) or consider an aftermarket option until an alternative OEM part is available.

Checking for power to the pump

To check for power to the pump of your John Deere 425, you'll first need to locate the fuse panel. This is found on the right side of the dash, near where your right knee would be when sitting on the tractor. The fuse panel is a small square panel with a couple of diodes and other electronics on it.

The John Deere 425 has two fuses: the Light fuse and the Power fuse. The Power fuse is the one you're interested in, as the wire for the fuel pump is wired into the same circuit. The fuse should be a full-sized coloured plastic tab-style fuse.

You can check if the fuse is blown by removing it and examining it. If it's blown, replace it with a new one of the same size and colour. If the new fuse blows, there is a short in the wire, and you'll need to remove the operator platform to access it.

You can also check for power to the pump with a 12-volt test light. Attach the ground of the test light to a clean ground, then use the tip of the light to touch the wire. With the key on, the wire should show 12-volt power.

Testing the pump

To test the pump on your John Deere 425, you will need to check for power at the pump. First, remove the fender deck and unhook the connector from the pump. Then, test for 12 volts of power at the pump using a 12-volt test light. Touch the ground of the test light to a clean ground, and use the tip to touch the wire. You can also try to reach the connector with the test light tip to check for power.

If there is no power at the pump, check the fuses. The fuse panel is located on the right side of the dash, near your right knee as you sit on the tractor. There are two fuses: the Light fuse and the Power fuse. The Power Fuse is likely the one connected to the fuel pump. Check and replace any blown fuses, using the same size and colour fuse.

If the fuse is blown, there may be a short in the wire, which will require removing the operator platform to access. There may also be damage to the wires under the seat, as mice often chew on wires in this area.

If there is power at the pump, but it is still not running, the pump may be faulty and need replacing.

Removing the fender deck

To remove the fender deck of a John Deere 425, follow these steps:

Park the machine safely with the park brake locked. Raise the hood and disconnect the negative battery terminal. Disconnect the seat switch wiring connector from the seat switch. Remove the retaining ring and pivot pin, and then remove the seat.

Next, remove the two bolts from the top of the fender deck. Take out the deck height adjustment knob. Remove the nut from the reverse pedal and take the pedal off. Do the same for the forward pedal.

Remove the nuts securing each side of the fender deck to the support brackets. Remove the fuel tank filler cap. Carefully remove the fender deck, guiding the seat switch wiring through the hole in the bottom of the fender deck. Immediately install the fuel tank filler cap to prevent dirt or debris from entering the fuel tank.

Now you can access the fuel pump to replace it.

Replacing the pump

To replace the fuel pump on a John Deere 425, follow these steps:

Firstly, check if your tractor has a fuel pump. John Deere 425 tractors have a fuel pump mounted inside the fuel tank. You can confirm a lack of fuel pressure by blowing from the filter back to the tank and observing bubbles, which indicate no obstruction in the tank.

Next, locate the fuel pump. To do this, you will need to remove the fender deck. Once located, unhook the connector and check for 12 volts of power. You can also test the pump by removing it from the tank and using jumper wires. If the pump does not run, it is likely faulty and needs replacing.

When you have the new fuel pump, you can install it by following these steps:

• Remove the fender deck for access to the fuel tank.
• Disconnect the wires and hoses from the old pump.
• Remove the old pump from the fuel tank.
• Clean the electrical wires and connections in the tank, ensuring they are pushed into the plug fully.
• Install the new fuel pump, ensuring the wires and connections are secure and correct.
• Reattach the fuel tank and fender deck.

It is also recommended to replace the fuel filter and the O-ring seal when replacing the fuel pump. The fuel filter is attached to the end of the pump, and the O-ring seal is located on the fuel tank sending unit.

Additionally, check the wires under the operator platform for any damage, as mice may have chewed on them.

Finally, always refer to the John Deere Technical Service Manual for your tractor for detailed instructions and diagrams.

Frequently asked questions