Ameer Randolph
The John Deere Gator is a series of utility vehicles designed to haul loads or traverse multiple terrains. The diesel engine used in Gator XUVs and UTVs is dependable, but the fuel line's airlock is an issue for many users. It is critical to bleed air from the fuel line to keep the engine running. This can be done by loosening the bleeder screw on the fuel filters and pumping the fuel pump primer lever. This article will provide a step-by-step guide on how to put together a Gator fuel line, including how to bleed air from the fuel line and address other common issues.
| Characteristics | Values |
|---|---|
| Vehicle Type | John Deere Gator |
| Vehicle Purpose | Hauling loads or travelling through multiple terrains |
| Engine Type | Diesel |
| Common Issue | Airlock in the fuel line |
| Solution | Bleed air from the fuel line by loosening the bleeder screw and pumping the fuel pump primer lever |
| Additional Steps | Fill the fuel tank with clean diesel fuel, ensure the valve is open, place a bucket underneath to prevent spills, and turn the vehicle on after priming |
| Other Issues | Water in the fuel line, old fuel |
| Suggested Solutions | Drain the system and refill with fresh fuel, use HEET to absorb water, replace the filter, use a new fuel plug |
| Fuel Line Connection | Double flare unions, Dorman nylon lines, GM-style fittings, compression fittings, rubber hose |
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What You'll Learn
Purging air from the fuel line
Firstly, fill up the fuel tank with clean diesel fuel. When the tank is full, the pressure inside the fuel line increases while priming the system, causing trapped air to be bled out faster. Next, turn the key to the 'on' position but do not crank the engine. Simply rotate the key one notch and then turn it off again. Check that the valve is open by ensuring the arrow on the valve is pointing upward.
Place a bucket underneath the vehicle to prevent oil spills, and check that the bleeder screws on the fuel filter are tightly closed. To bleed air from the fuel line, loosen the bleeder screw on the fuel filter and pump the fuel pump primer lever. After priming the fuel system, you can turn the vehicle on.
If your Gator vehicle does not have a code lamp, you can watch for engine RPMs while cranking. You should have at least 600 RPM during cranking if RPMs are displayed. If no RPMs are displayed, check the ECU fuses to ensure the engine controller is powered. You can also test for 5 volts at the fuel rail sensor. If you have 5 volts at the sensor, then you know the ECU is powered.
If your fuel tank gets empty while driving, air can penetrate the fuel line. This can also happen during routine maintenance, especially when replacing the fuel filter. In this case, drain the system and refill with fresh, clean fuel. Replace the filter, as it likely absorbed some moisture.
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Bleeding air from the fuel line
Before attempting to bleed the air from the fuel system, ensure you have determined how air entered the fuel system so that air does not re-enter the system after completing the bleeding process. Air can enter the diesel engine's fuel system in several ways, most commonly by running out of fuel, from leaks in your fuel lines, or after a fuel filter change.
To bleed air from the fuel line, you need to first fill up the fuel tank with clean diesel fuel. When the tank is full, it will increase pressure inside the fuel line while priming the system, and the trapped air will be bled out faster. When the vehicle is in the off position, turn the key to the on position. Remember not to crank the engine. Just rotate the key one notch and then turn the key to the off position again. Check whether the arrow on the valve is pointing upward to ensure it is open. Bleed screws are usually located on the fuel filter of your vehicle. Before starting to bleed air from the system, place a bucket underneath to prevent oil spills.
Loosen the bleeder screw on the fuel filters and pump the fuel pump primer lever to bleed air from the fuel line. After priming the fuel system, you can turn the vehicle on. A mixture of air and fuel should bleed from the loose screw. Allow the bleeding to continue until only fuel (without air bubbles) flows from the screw. Tighten the bleeder screw securely. If the fuel filter does not have a bleeder screw, you may need to loosen the filter slightly to allow the air to escape. If your fuel filter does not have a bleeder screw, or if you think air remains in the system, you may need to bleed the fuel system at the fuel injectors.
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Fuel tank filling procedure
Filling a fuel tank is a delicate procedure that requires careful attention to avoid issues with the engine. Here is a step-by-step guide on how to fill your fuel tank and avoid any problems:
Firstly, ensure your safety by wearing protective gear, such as gloves and eye protection, and perform the procedure in a well-ventilated area or outdoors.
Before filling the tank, inspect the fuel lines for any signs of damage or leaks. It is crucial to address any issues with the lines before proceeding. Next, you will need to acquire the correct type and amount of fuel for your vehicle. This is usually specified in the user manual or vehicle specifications. If you are unsure, it is best to consult a mechanic or a knowledgeable source.
Now, you can begin filling the tank. Place a bucket or container underneath the tank to catch any spills or leaks. Slowly and carefully pour the fuel into the tank, ensuring that the surrounding area remains clean and free of any fuel. Once the tank is filled to the appropriate level, securely replace the fuel cap.
After filling the tank, it is important to bleed air from the fuel line to prevent issues with the engine. Loosen the bleeder screw on the fuel filter, and then pump the fuel pump primer lever to release air from the system. Finally, turn the vehicle on.
If you encounter any issues during the process, such as difficulty starting the engine, consult a mechanic or a specialist forum for guidance.
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Fuel line repair
Before starting any fuel line repair, it is crucial to take safety precautions. Work in a well-ventilated area, wear protective gear, and ensure there are no open flames or sparks that could ignite the fuel. It is also recommended to relieve the fuel system pressure and disconnect the battery to prevent any accidental electrical discharges.
The first step in repairing a fuel line is to identify the issue. Common problems include leaks, cracks, or damage caused by age or road debris. Once the problem is identified, drain the fuel system and remove the damaged section of the fuel line. This may involve loosening clamps or fittings to access the affected area. It is important to catch the drained fuel in a suitable container to prevent spills and environmental contamination.
After draining the fuel system and isolating the damaged section, measure and cut the nylon fuel line to the required length, ensuring a precise fit. Using the appropriate tools, install the new section of the fuel line, securely clamping or pressing the fittings in place. It is crucial to follow the vehicle manufacturer's specifications and torque settings to avoid leaks or further damage.
Finally, before starting the vehicle, it is essential to bleed air from the fuel line. This process involves loosening the bleeder screw on the fuel filter and pumping the fuel pump primer lever to remove trapped air. Filling the fuel tank with clean fuel can help increase pressure and expedite the bleeding process. Once complete, turn the vehicle on and check for any signs of leaks or issues.
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Fuel line connection
One approach is to use compression fittings, which involve compressing the fitting onto the tube to create a tight seal. While this method is commonly used in various applications, it is important to note that compression fittings are not legal for fuel and brake lines in certain regions, such as Canada, due to safety concerns.
Another widely recognised method is to double flare the fuel lines, creating an inverted flare to join the lines with a union. This technique is similar to the process used for joining brake lines, and it provides a positive seal that can withstand high pressure. The double flare method can be easily performed using a tube flaring kit available from automotive stores.
When connecting fuel lines, it is crucial to select the appropriate fittings and materials. For instance, nylon lines, such as Dorman nylon lines, are recommended for fuel injection lines as they are resistant to fuel additives that can degrade regular rubber hoses. GM-style fittings can be used in conjunction with nylon lines, and the necessary tools can be sourced from automotive suppliers.
In some cases, brass fittings may be preferred for connecting fuel lines. This typically involves flaring the lines and using a MAP gas torch, Oaty flux, and solder to create a secure connection. Additionally, an acetylene torch can be utilised for brazing with a brazing rod, providing an even stronger joint.
It is important to consult relevant regulations and seek expert advice when connecting fuel lines to ensure compliance with safety standards and to prevent potential hazards.
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Frequently asked questions
To put together a Gator fuel line, you will need to follow these steps:
- Fill up the fuel tank with clean diesel fuel.
- Turn the key to the "on" position without cranking the engine.
- Locate the bleeder screw on the fuel filter and loosen it.
- Pump the fuel pump primer lever to bleed air from the fuel line.
- After priming, turn the vehicle on.
You will need a swedging tool, a MAP gas torch, Oaty flux, Oaty solder, and a brazing rod.
It is recommended to use Dorman nylon lines and GM-style fittings.
Yes, you can use 3/8" and 5/16" brake lines with F.I. rubber hose for flexibility at the engine and filter.
