Regan Brown
The fuel filler neck is a tubular steel component that connects the fuel filler inlet to the rubber fuel hose on the gas tank. Over time, the neck can rust and leak, or the rubber hose can weather-crack, causing fuel leaks. Repairing a fuel tank filler neck can be done in a few different ways, depending on the vehicle and the nature of the damage. Some common methods include using a repair kit, welding or soldering, and replacing the entire neck.
Characteristics and Values Table for Repairing a Fuel Tank Filler Neck
| Characteristics | Values |
|---|---|
| Tools | Soldering iron, PVC plumbing coupling, hand-held grinder, disk grinder, Dremel, caliper, brass hammer, brass chisel, plastic welding tools, epoxy, etc. |
| Steps | Remove fuel filler cap cable, locate and lower fuel tank, disconnect harness, remove fuel filler neck, clean and replace parts, raise fuel tank, attach vent hose, etc. |
| Safety | Avoid using sparks or flames near open fuel tank, use spark-proof tools, ensure proper ventilation, wear protective gear, etc. |
| Common Issues | Rust, weather-cracked rubber hose, snapped-off filler necks, inoperative fuel pumps, damaged fuel line connectors, etc. |
| Solutions | Repair or replace fuel filler neck, use plastic welding or epoxy to fix cracks, clean and replace rubber hose and clamps, replace fuel tank if necessary, etc. |
| Vehicle Compatibility | Chevrolet, GMC, GM SUVs and trucks, Polaris tanks, Arctic Cat, Indy tank, etc. |
| Commercial Kits | AUTOVIC Fuel Tank Filler Neck Repair Kit, Dorman 577-106 Fuel Filler Neck Inlet Check Valve, Forwinparts Fuel Gas Tank Filler Neck, etc. |
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What You'll Learn
Inspect the rubber hose for cracks and replace if necessary
The rubber hose on a fuel tank filler neck can become weather-cracked over time, causing fuel leaks. Therefore, it is important to inspect the rubber hose for cracks and replace it if necessary.
To inspect the rubber hose for cracks, locate the fuel tank and lower it to gain access to the hose. Once you have located the hose, carefully examine it for any signs of cracking or deterioration. If there are any cracks, no matter how small, it is important to replace the hose to prevent fuel leaks.
If the rubber hose needs to be replaced, start by removing the fuel filler neck and guiding it out of the area. Be sure to transfer any fuel out of the tank before removing the neck. Then, take a new rubber hose and twist it into the fuel filler neck. Secure the hose in place with a new clamp, tightening it until it is secure and does not move.
When replacing the rubber hose, it is important to use a hose that is compatible with your vehicle's fuel system. You can find replacement hoses online or at an auto parts store. Be sure to follow any manufacturer instructions or recommendations when installing the new hose.
In some cases, you may be able to repair a cracked rubber hose without replacing it. For example, some people have used plastic welding or soldering irons to repair cracks in the hose. However, it is important to note that gluing the hose with epoxy or other adhesives should be avoided as it can inhibit the welding process and may not be effective in preventing fuel leaks.
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Clean the harness and connector to the fuel pump
To repair a fuel tank filler neck, you must first remove the fuel filler cap cable from the fuel neck and place it aside. Next, locate the fuel tank by going under the vehicle. Once you've found it, lower the fuel tank using a transmission jack or similar device, and loosen and remove the straps.
Now, you can disconnect the harness from the connector. Reach up on top of the fuel tank and locate the harness attached to the tank. This is the harness for the fuel pump or sending unit on older vehicles.
First, you will need to remove any moisture and debris from the connector and harness. To do this, use electrical cleaner and a lint-free cloth. Spray the connector with the cleaner and wipe it down with the cloth. Be sure to remove any grime or debris that may be present.
Next, you will need to inspect the harness for any signs of damage or overheating. If you are having issues with the fuel system and are still running the original pump, this is especially important. Check the pump hat's connector for the wiring harness from the car. There is a known problem with the design of some fuel pumps, which can lead to issues down the line.
If your vehicle is a 2017 model or older, it is likely to have this problematic pump style. You can quickly check this by looking up a new fuel pump on a site like RockAuto, which provides pictures of actual parts. If the fuel pump has the internal wiring harness with two large wires next to each other, it is the old design and should be replaced.
Finally, you can reassemble the fuel pump connector and harness. Ensure that all connections are secure and that there is no debris or grime present.
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Remove the fuel filler neck
To remove the fuel filler neck, you will need to first locate the fuel tank. Go under the vehicle and look for the fuel tank. Place a transmission jack or similar jack under the fuel tank. Loosen and remove the straps holding the fuel tank in place and lower it slightly.
Reach up and feel for a harness attached to the top of the fuel tank. This is the harness for the fuel pump or sending unit on older vehicles. Lower the fuel tank further to access the vent hose attached to the fuel tank. Remove the clamp and vent hose to allow more clearance.
Note that vehicles from 1996 and newer may have a return fuel charcoal canister attached to the vent hose to collect fuel vapors for emissions. Be sure to disconnect the harness from the connector before attempting to remove the fuel filler neck.
If you are repairing a truck, you may need to remove the spare tire to gain access to the neck. In some trucks, you can replace the fuel filler neck without dropping the fuel tank. If you do need to remove the fuel tank, be sure to transfer any fuel out of the tank before proceeding. It is best to have the vehicle at a quarter tank of fuel or less when removing the fuel filler neck.
Once you have accessed the fuel filler neck, you can begin the process of removing it. This may involve unscrewing screws, detaching hoses, and carefully disengaging any other components that are connected to the neck. Be sure to have a container or tray ready to catch any residual fuel that may leak out during the removal process.
If the fuel filler neck is damaged or broken, you may need to cut or grind through certain parts to access and remove it. Be extremely cautious when performing any cutting or grinding, as the fuel tank contains flammable liquids and vapors. Always take the necessary safety precautions, such as wearing protective gear and ensuring proper ventilation.
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Plastic weld the neck back on
Plastic welding is a recommended method to repair a broken fuel tank filler neck. This method involves using a soldering iron to melt the cracked edges of the neck together. Before beginning the welding process, it is important to take the necessary measurements. The measurement from the top of the neck to the top of the lip at the base of the filler neck is crucial, as it ensures that the cap will fit properly after the repair. The PVC coupling used in the repair should be cut to a length that allows the cap to screw down and seal properly without interfering with the rubber gasket.
To start the plastic welding process, first prepare the coupling by grinding, filing, or sanding its outside diameter so that it slips into the neck easily. It should be a light slip, with the lip in the tank preventing it from falling into the tank. Next, slip the coupling into the tank and place the broken neck piece over it, spinning it around so that the cracked edges line up. Now, use the soldering iron to melt and fuse the cracked edges together.
It is important to note that the tank should be cleaned thoroughly after the repair to remove any debris or "stuff" that may have entered during the repair process. Additionally, it is recommended to avoid using epoxy or glue to attach the neck back on, as it may interfere with the plastic welding process.
This repair method has been used successfully for over 12-15 years on various vehicles, including a 2002 Arctic Cat ZL600, and has proven to be a solid and reliable solution. It is important to follow the steps carefully and take the necessary precautions to ensure a safe and effective repair.
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Use a repair kit to fix the broken filler neck
Using a repair kit is an option to fix a broken fuel tank filler neck. There are a few steps to follow to ensure a successful repair. Firstly, it is important to take measurements. The length of the filler neck and the diameter of the pipe are crucial to know when selecting a repair kit. It is also important to identify the make and model of your vehicle, as some filler necks are specific to certain models.
Once you have the correct repair kit, you can begin the repair process. If your vehicle has a spare tire, remove it to gain access to the filler neck. Next, disconnect the fuel filler cap cable from the fuel neck and set it aside. This will give you more room to work. Now, you can install the new filler neck. Follow the instructions that come with your repair kit, as different kits may have slightly different installation processes. Typically, you will need to insert the new filler neck into the rubber hose and twist it into place. Ensure that the hose is clean and free of cracks before installing the new filler neck.
After installing the new filler neck, you will need to reconnect the fuel filler cap cable and secure any clamps or bolts that hold the filler neck in place. It is important to torque these fasteners to the manufacturer's specifications to prevent leaks and ensure a secure fit. Once the repair is complete, it is a good idea to test the vehicle and ensure that the repair was successful. Take the vehicle for a drive and check for any leaks or unusual behaviour.
Using a repair kit to fix a broken fuel tank filler neck can be a straightforward process if the correct steps are followed. It is important to take your time and ensure that all measurements are correct and the repair kit is suitable for your vehicle. By following these steps and the specific instructions for your repair kit, you can successfully repair a broken fuel tank filler neck and restore the functionality of your vehicle's fuel system.
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