Relieving Fuel Pressure On A John Deere 728: Step-By-Step Guide

If your John Deere 728 has run out of fuel, it is important to relieve the fuel system pressure before starting the engine to avoid damage. This can be done by following the steps outlined in the machine operator's manual. First, loosen the fuel pressure relief screw on the left side of the machine by turning it two times. Do not remove the screw. Next, cycle the key back and forth between the 'Stop' and 'Run' positions several times without turning it to the 'Start' position. Finally, tighten the pressure relief screw.

Loosen the air bleed screw

To relieve fuel pressure on a 728 John Deere, you must first locate the air bleed screw. This can be found on the fuel filter base, where there are three bleed screws. The air bleed screw will be the one on the far left. Once you have located the air bleed screw, you can loosen it using the appropriate tool.

After loosening the air bleed screw, the next step is to cycle the fuel pump. This will help to push fuel through the line and build up pressure. It may take a few cycles of the fuel pump to get the pressure back to the desired level. Make sure that you have a container ready to catch any fuel that may spill out when you loosen the screw.

If you are still having issues with the fuel pressure, there are a few other things you can try. First, check that the fuel lines are connected properly and that there are no leaks. Also, ensure that the fuel filter is full of fuel and pointing towards the engine. Additionally, you can try opening the fuel pressure relief screw, which is located on the left side of the machine, and cycling the key back and forth between the "Stop" and "Run" positions several times. Do not turn the key to the "Start" position. Finally, tighten the pressure relief screw and attempt to start the engine.

If you continue to experience problems with the fuel pressure on your 728 John Deere, it may be necessary to consult a professional for further assistance.

Cycle the fuel pump until fuel is visible

To relieve fuel pressure on a 728 John Deere, you must first loosen the fuel pressure relief screw on the left side of the machine. Turn the screw two times anti-clockwise to relieve the pressure. Do not remove the screw.

Now, you can cycle the fuel pump until fuel is visible. This is done by moving the key back and forth between the 'Stop' (Off) and 'Run' positions several times. Do not turn the key to the 'Start' (Crank) position.

Once you have cycled the fuel pump and visible fuel is present, tighten the pressure relief screw.

This process is important as it ensures that the engine is not damaged when it is started after running out of fuel.

Check the fuel filter

To check the fuel filter on a John Deere 728, you will need to locate the fuel filter. The fuel filter on a John Deere 728 is located near the engine, typically on the left side of the machine. Once you have located the fuel filter, follow these steps:

• Shut off the engine: Before performing any maintenance or repairs on your John Deere 728, it is important to ensure that the engine is shut off and the machine is parked on a level surface. This will help prevent any accidental startups or unsafe conditions during the maintenance process.
• Locate the fuel filter: As mentioned, the fuel filter is typically located on the left side of the engine. It is usually a black or white cylindrical component with a metal or plastic housing.
• Inspect the fuel filter: Visually inspect the fuel filter for any signs of damage, leaks, or cracks. Also, check the fuel lines connected to the filter for any signs of leaks or damage.
• Check the fuel filter housing: If the fuel filter is housed within a metal or plastic casing, carefully open or remove the casing to access the filter. This will allow you to inspect the filter more thoroughly.
• Check the fuel filter element: Remove the fuel filter from its housing (if applicable) and inspect the filter element. The filter element is the part of the filter that directly filters the fuel. It is typically a white or off-white colour and may appear dirty or clogged if it needs to be replaced.
• Check the fuel filter for debris or water: In some cases, the fuel filter may become clogged with debris or contain water. Carefully detach the fuel lines from the filter and check the inlet and outlet of the filter for any signs of debris or water. If the filter appears clogged, it will need to be replaced.
• Check the condition of the fuel filter: If the fuel filter appears to be in good condition, with no signs of damage, leaks, or clogging, it may not need to be replaced. However, it is always a good idea to refer to the manufacturer's maintenance schedule and replace the fuel filter at the recommended intervals.
• Reinstall the fuel filter: If the fuel filter appears to be in good condition and does not need to be replaced, carefully reinstall it into its housing and secure it in place. Ensure that all fuel lines are properly connected and secured before starting the engine.
• Start the engine and check for leaks: Once you have completed your inspection and maintenance of the fuel filter, start the engine and check the fuel filter and fuel lines for any signs of leaks. If there are no leaks, and the engine is running smoothly, your fuel filter is likely in good condition.

It is important to note that the fuel filter on a John Deere 728 should be replaced at regular intervals, as recommended by the manufacturer. This will help ensure optimal engine performance and prevent fuel system issues. Additionally, if you suspect that your fuel filter is clogged or damaged, it is always best to replace it with a new, manufacturer-approved fuel filter to ensure the proper functioning of your machine.

Check the fuel pressure relief screw

To check the fuel pressure relief screw on your John Deere 728, first locate the screw on the left side of the machine. It should be a 1/2-inch head bolt. Next, loosen the screw by turning it a few times to relieve the pressure in the fuel line. Be careful not to remove the screw completely, as this can cause fuel to leak out. Once the pressure is relieved, cycle the key between the "Stop" and "Run" positions several times without turning it to the "Start" position. Finally, tighten the pressure relief screw back in place.

If you find that the area around the relief screw is getting wet or leaking fuel after tightening the screw, there may be an issue with the O-ring. Remove the screw and inspect the O-ring for any damage or nicks. If the O-ring is damaged, replace it with a new one that is compatible with gasoline. Make sure the replacement O-ring is the correct size and has the appropriate cross-section. You may need to refer to a parts manual or consult a dealer to find the correct O-ring size.

It is important to note that relieving fuel pressure is necessary when starting the engine after running out of fuel. This step should be performed before attempting to start the engine to avoid potential damage. Additionally, always exercise caution when working with fuel and ensure that there are no leaks or spills.

Check the fuel pump

To check the fuel pump of your John Deere 728, you will need to inspect the fuel filter and pump.

Firstly, locate the fuel filter. This is usually found attached to the fuel pump, which is located inside the fuel tank. The fuel filter for the John Deere 728 is known as the AM117584. You will need to remove and replace this fuel filter periodically as part of regular maintenance. When doing so, check the fuel pump for any signs of damage or deterioration.

If your engine is not starting, it is worth checking the fuel pump for any issues. A faulty fuel pump may cause the engine to backfire and randomly shut off. To check the fuel pump, you will need to connect it directly to the battery using alligator clips. Place the positive alligator clip on the positive terminal of the battery, and then connect the other end to the fuel line. Repeat this process for the negative terminal and the other end of the fuel line. With the fuel lines unplugged from the carburetor, turn on the ignition and observe the fuel flow. If the fuel is pumping out very fast, the pump is working correctly. However, if the fuel is only trickling out, the pump needs to be replaced.

If you are experiencing surging issues with your John Deere 728, it is worth checking the fuel pump and fuel lines for any problems. Surging can be caused by limited fuel flow, ignition problems, or air leaks in the manifold. Check that the fuel pump is securely connected to the fuel lines and that there are no leaks.

Additionally, if you have run out of fuel, you will need to bleed the fuel lines and check the fuel pump before restarting the engine. Loosen the fuel pressure relief screw on the left side of the machine by turning it two times to relieve the pressure. Do not remove the screw. Then, cycle the key back and forth between the 'Stop' and 'Run' positions several times without turning the key to the 'Start' position. Finally, tighten the pressure relief screw before attempting to restart the engine.

Frequently asked questions