Rajan Wilcox
The John Deere 4020 tractor is a popular model that has been in use for many years. However, some users have reported issues with clogged fuel lines, which can be caused by debris in the check valve on the injector pump or a build-up of leaves and debris in the tank. To address this, it is recommended to clean the check valve and ensure that the fuel tank is free of debris. In some cases, it may be necessary to bleed the fuel lines to remove air pockets, which can be done by loosening the bleed valve and pumping until air-free fuel comes out. Additionally, it is important to check the fuel filters and ensure they are not clogged, as this can impact the flow of fuel to the engine.
How to fill fuel lines on John Deere 4020
| Characteristics | Values |
|---|---|
| Fuel tank draining method | Siphon hose |
| Fuel filter | Square filter |
| Fuel starvation problem | Connect a test line direct to the Number 30 location |
| Clogged fuel lines | Blow compressed air into the line from the fuel filter to the tank |
| Bleeding the lines | Loosen the bleed valve |
| Air in the injector | Remove the screw or valve |
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What You'll Learn
How to drain the fuel tank
To drain the fuel tank of a John Deere 4020 tractor, you can use a siphon hose. This is a good old method that has been suggested by many users. The tank has a fill hole and a small line to the engine, which you can locate and dismount.
There is also a drain cock, similar to the one found on a car radiator. To open it, turn it to the right, just as you would to tighten a bolt. You can add a piece of fuel line to direct the fuel into a jug, preventing it from spilling onto the frame and the ground.
Some users have also reported issues with debris in the check valve on the injector pump, which may cause the tractor to lose power. To address this, you can clean the check valve, run the tractor with the return line disconnected, or remove the fitting and the check ball.
Additionally, it is recommended to check the fuel return line (item number 29). If it is stopped up, the pump may shut down due to internal pressure. Some return lines have check valves, which should be examined. If you find debris or a "coffee ground" material, it indicates an issue with the governor ring in the pump.
Finally, to fill the fuel lines, ensure there is a good flow of fuel coming out of the elbow that the pressure line goes to (item number 5000). Check for any debris or leaves that may be causing blockages.
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How to bleed the lines
To bleed the lines of your John Deere 4020 tractor, you will need to first loosen the line at parts key #30 and purge the air. If the tractor still won't start, you will need to loosen the injector lines at the injectors. It is important to keep your fingers and skin away from spraying diesel during this process. Spin the engine until air-free fuel starts coming out of the lines, then tighten the lines and start the engine.
If the engine still won't crank, you will need to loosen the bleed valve. This is typically the little plastic turnscrew at the bottom of the lower fuel filter. You should have bleeders at the top and bottom of the filters to ensure all the air is removed. Try this before loosening the injector lines.
If the tractor still won't start, the problem may be debris in the check valve on the injector pump. To check this, remove the check valve and run the tractor with the return line disconnected from the check valve. If the problem is debris, you will need to clean the check valve and put it back in.
If your tractor has no fuel, you will need to check the electric fuel shut-off. Not all 4020 tractors have an electric shut-off, so first, determine which model injection pump you have. If you have a small, roundish CBC pump, the solenoid is external, located on the side of the pump. If you have a rectangular DB or JDB pump, the solenoid is inside the top cover of the pump.
If you are still having issues, you may have a fuel starvation problem. You can test this by making a test hose and running it out of a raised fuel can. Connect the test line directly to the Number 30 location.
Finally, if you are still having issues, you may need to drain your fuel tank. To do this, use a siphon hose to drain the fuel from the fill hole.
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How to check for debris in the check valve
To check for debris in the check valve of your John Deere 4020, you will need to first locate the check valve. The check valve is typically located on the injector pump, which is responsible for supplying fuel to the engine.
Once you have located the injector pump, you can inspect the check valve for any signs of debris or blockage. In some cases, you may need to remove the check valve for a more thorough inspection. This can be done by loosening the line at parts key #30, as suggested by a user on TractorByNet. They further advise that if the tractor still won't start, you should then loosen the injector lines at the injectors. It is important to exercise caution during this step, as diesel fuel may spray out.
After inspecting the check valve, you may find that it is clogged with debris, as reported by several John Deere 4020 owners. This debris can include leaves, dirt, and other small particles that have made their way into the fuel system. If debris is present, it is important to clean or replace the check valve to ensure proper fuel flow and engine performance.
In addition to checking the check valve, it is recommended to inspect other components in the fuel system for debris, such as the fuel lines, filters, and the fuel tank. For example, one user on Yesterday's Tractors forum discovered debris in their sump screen and drain holes, which they attributed to water getting into the brake pedal seals. Regular maintenance and cleaning of these components can help prevent debris buildup and ensure the optimal performance of your John Deere 4020 tractor.
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How to identify fuel starvation
Fuel starvation is a situation where the fuel system fails to supply sufficient fuel for the engine to operate properly. This can occur even when there is enough fuel in the tank. Common causes of fuel starvation include blockage, vapour lock, contamination by water, malfunction of the fuel pump, or incorrect positioning.
To identify fuel starvation, it is important to regularly check your fuel for any signs of contamination or starvation. Monitoring the fuel burn rate and the status of the fuel in the tank is crucial. This can be done by gaining a good understanding of the aircraft's performance, gauges, logbooks, and the level of fuel in the tank. Additionally, checking for debris in the check valve on the injector pump is important, as this can lead to fuel starvation.
In the case of the John Deere 4020, if the tractor won't start, you can try loosening the line at parts key #30 and purging the air. If it still won't start, loosen the injection lines at the injectors, being cautious to keep your skin away from spraying diesel. Spin the engine over until air-free fuel comes out of the lines, then tighten the lines and start the engine.
If you suspect fuel starvation, it is best to consult with an expert for guidance and to prevent the issue from becoming more serious or costly.
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How to remove air from the injector
To remove air from the injector of a John Deere 4020, you must first identify the source of the problem. In some cases, the issue may be related to debris in the check valve on the injector pump, a clogged fuel line, or a faulty fuel filter. Here is a step-by-step guide on how to remove air from the injector:
Firstly, loosen the fuel line at parts key #30 and purge the air. If the tractor still fails to start, proceed to loosen the injector lines at the injectors. Exercise caution during this step, ensuring your hands and skin are clear of spraying diesel. Crank the engine until fuel, free of air bubbles, comes out of the lines. Once this is achieved, tighten the lines and attempt to start the engine.
If the tractor still fails to start, the issue may lie with the injector pump itself. To remove the injector pump for repair or replacement, first, remove the hood by unscrewing one bolt on each side at the rear of the hood. Next, detach the side screens by pulling on their tops and turning the spring-loaded pins at their base. The pre-cleaner bowl can then be removed by lifting it off the pipe. Finally, lift the hood away from the breather pipe and muffler.
For a more detailed procedure, refer to specific John Deere 4020 manuals or consult a qualified mechanic.
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Frequently asked questions
You can fill the fuel lines on your John Deere 4020 by using a siphon hose.
There could be debris in the check valve on the injector pump. Try cleaning it out and putting it back in. If this doesn't work, you may have a fuel starvation problem.
To bleed the lines, loosen the bleed valve. You should have bleeders at the top and bottom of the filters to get all the air out.
You can hook an injector to one of the lines and crank the engine to see if fuel sprays out.
