Regan Brown
The John Deere LA 120 fuel filter is a common component in many John Deere tractors and lawn mowers. While the fuel filter is generally reliable, it may occasionally need to be replaced or primed. Priming the fuel filter involves purging air from the fuel lines and ensuring that the filter is filled with fuel. This process can be done by loosening the bleed screw on the filter and using a hand pump to fill the filter. Additionally, opening the bleeder on the injection pump and cranking the throttle to the full fuel position can help ensure that all air is purged from the system. With the right steps, priming the John Deere LA 120 fuel filter can be a straightforward task.
| Characteristics | Values |
|---|---|
| Fuel pump compatibility | John Deere L-100, L-120, L-118, L107, L108, L118, LA120 |
| Fuel filter compatibility | John Deere L-100, L-120, L-118, L107, L108, L118, LA100, LA105, LA110, LA115, Z225 Lawn Mower |
| Installation time | 10 minutes |
| Performance | Effective with two filters |
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What You'll Learn
Troubleshooting a John Deere LA120 fuel filter
If your John Deere LA120 tractor is experiencing issues with fuel delivery, there are several troubleshooting steps you can take to identify and resolve the problem.
First, check that the fuel filter is installed correctly. Ensure that the inlet side of the filter is connected to the line coming from the fuel tank, and the outlet side is connected to the line leading to the carburetor. Verify that neither of these lines is connected to the crankcase. There should be a third line, known as the pulse line, connecting the crankcase to the fuel pump.
If the fuel filter and lines appear correctly installed, the next step is to determine if the filter is clogged. To do this, pull the inlet hose off the filter. If the tank is full, fuel should flow out. If fuel flows freely with the line removed but not when it is connected, the filter is likely clogged and needs replacement.
If you have recently replaced the fuel pump and are still experiencing issues, check the vacuum pipe running to the rocker cover. If the rubber is split or cracked, the pump may not function properly.
In some cases, air may be trapped in the fuel system, preventing fuel from reaching the filter. To address this, you can use a vacuum squeeze-bulb or any other suitable method to create a siphoning effect on the feed tube in the tank. This will help to establish a solid flow of fuel.
If you are still unable to prime the fuel system, consider loosening the bleed screw on the filter and using a hand pump to fill the filter and purge air from the line. Then, open the bleeder on the injection pump and purge any remaining air.
By systematically working through these troubleshooting steps, you can identify and address common issues related to the fuel filter and fuel delivery system in your John Deere LA120 tractor.
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Changing the fuel filter
To change the fuel filter on a John Deere L120, you will need to purchase a replacement fuel pump with a fuel filter. This can be bought online and should come with installation instructions.
One product, the HURI Fuel Pump with Fuel Filter, is a good option as it comes with two filters and customers have reported that it is easy to install and works effectively.
Before changing the filter, ensure that the engine is cold. This is because when the engine is cold, the level of fuel in the filter will be lower than when the engine is warm.
Once you have installed the new fuel pump and filter, you will need to prime the fuel system. To do this, first loosen the bleed screw on the filter. Then, use the hand pump to fill the filter and purge all the air from the line. Next, open the bleeder on the injection pump and purge any remaining air out up to the pump. Finally, tighten the bleeder screw and start the engine.
If the injectors were run dry, you may also need to bleed them. To do this, open the injector lines at the injectors and crank the throttle to the full fuel position. Keep cranking until fuel comes out of the injector lines, then tighten the lines and crank the engine.
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Bleeding the fuel system
First, loosen the bleed screw on the fuel filter. This will allow air to escape from the fuel system. It is important to ensure that the hand pump is used to fill the filter and purge all the air from the line.
Next, open the bleeder on the injection pump and continue purging the air until you reach the pump. At this point, you may need to open the injector lines at the injectors and crank the throttle to the full fuel position. This will ensure that any remaining air is removed from the injector lines.
If the injectors were run dry, you may need to pay extra attention to bleeding them. It is recommended to crank the unit with the injectors open and at full throttle until fuel starts coming out of the injector lines. Once this happens, tighten the injectors and crank the unit again.
In some cases, you may need to take additional steps. For example, removing the plug from the bottom of the injector pump and the plugs on the side next to the lines going to the injectors. If you follow these steps correctly, you should successfully bleed the fuel system of your John Deere tractor, ensuring optimal performance and engine health.
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Purging air from the fuel line
To purge air from the fuel line, first, fill up the fuel tank with clean diesel fuel. Then, loosen the bleed screw on the filter and use the hand pump to fill the filter and purge the air from the line. Next, open the bleeder on the injection pump and purge any remaining air from the system. Finally, if necessary, open the injector lines at the injectors and crank the throttle to the full fuel position until fuel comes out of the injector lines. Then tighten and crank the unit.
It is important to note that the injectors only need to be bled if they were run dry, such as when the tractor runs out of fuel.
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Using a hand pump to fill the filter
To prime the fuel filter on a John Deere tractor, you will need to use a hand pump to fill the filter and purge air from the line. Here is a step-by-step guide:
First, loosen the bleed screw on the filter. This will allow you to access the filter and prepare it for filling. Make sure that the fuel tank is full before proceeding to the next step.
Next, use the hand pump to fill the filter. Place the hand pump on the filter and pump slowly and steadily to fill it with fuel. Ensure that you are using the correct type of fuel for your tractor, as specified in the owner's manual.
Once the filter is filled, purge all the air from the line. This step is crucial to ensure that the fuel system is primed correctly. You may need to loosen the inline from the filter to do this effectively.
After purging the air, open the bleeder on the injection pump and continue to purge any remaining air from the system. Pay close attention to the injectors, as they may need to be bled if they were run dry.
Finally, crank the engine for a few seconds and pump the hand primer again to build pressure in the system. If necessary, crack the lines loose at the injectors, and when you start to see fuel, close them.
By following these steps, you should be able to successfully prime the fuel filter on your John Deere tractor using a hand pump.
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