Ameer Randolph
Chainsaw fuel tanks can be made from plastic and are prone to cracking and leaking. If your chainsaw is leaking gas, you should check the fuel tank, grommet, primer bulb, and gasket. Gaskets are designed to create a seal to prevent fuel from leaking out of the fuel tank. If the gasket is worn or damaged, the seal will not be created and fuel can leak out. In some cases, the gasket is simply an O-ring inside the fuel cap that creates the seal. A damaged or missing gasket will need to be replaced. If your chainsaw doesn't start even though it has plenty of gas, the engine might not be getting fuel because a fuel line is clogged or cracked. This can be an urgent repair as cracked or leaking fuel lines pose a fire hazard.
Chainsaw Fuel Tank Repair Characteristics and Values
| Characteristics | Values |
|---|---|
| Reasons for repair | Chainsaw not starting, leaking gas, clogged fuel line, cracked fuel tank, damaged fuel tank cap, stale fuel, dirty air filter, bad spark plug, etc. |
| Repair process | Drain fuel, remove screws and air filter cover, disconnect throttle linkage, pull fuel lines from carburetor and primer bulb, cut and insert new fuel lines, trim and connect to carburetor, sand repaired area, refill tank, check for leaks. |
| Considerations | Use proper tools and safety equipment, refer to repair guides and product manuals, perform repairs in moderate temperatures, use specialized products for fuel tanks, regularly inspect and maintain chainsaw. |
| Benefits | Cost-effective, gain confidence and skills, prevent future issues. |
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What You'll Learn
Replacing a damaged fuel tank
If your chainsaw has a damaged fuel tank, you may be able to repair it or replace it. If the damage is minor, repairing is cost-effective. However, for extensive damage, it is recommended to replace the tank for safety reasons.
- Purchase a replacement fuel tank that is compatible with your chainsaw model.
- Familiarize yourself with the chainsaw components and know your way around the chainsaw.
- Wear work gloves to protect your hands and ensure that you are working in a well-ventilated area.
- Remove the fuel cap and empty the fuel tank into an approved storage container.
- Using an Allen wrench, remove the screws that hold the cylinder shield to the engine, and then lift off the shield.
- Pull the carburetor from the engine block, sliding it along the mounting studs. Be careful not to bend the throttle linkage or damage the gas lines.
- Remove the mounting nuts, air filter housing, and pull the carburetor off the mounting studs.
- Use needle-nose pliers to pull the fuel lines off the carburetor and primer bulb. With some chainsaw models, you may need to remove the screws from the primer bulb to detach the fuel lines.
- Pull the fuel lines out of the gas tank.
- Install the new fuel tank according to the manufacturer's instructions, ensuring that all connections are secure.
- Reinstall the cylinder shield on the chainsaw.
- Refill the new fuel tank and check for any leaks.
It is important to note that undertaking repairs to appliances can be hazardous. Always use the proper tools and safety equipment, and follow all instructions. If you are unsure about any steps or feel uncomfortable performing the repair, it is recommended to consult a qualified technician.
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Checking for fuel leaks
If your chainsaw is leaking fuel, there are several places on the fuel tank that could be the source of the problem. The first step is to empty the tank and inspect the cap and its seal for any damage. The cap screws onto the tank, and a thin rubber seal, along with the suction of the piston, keeps the gas in the tank. A damaged seal will need to be replaced.
Next, carefully inspect the tank for any cracks, splits, or tiny puncture marks, which can occur if you accidentally pop the chain off the bar. The fuel tank is a plastic reservoir that can become brittle and crack over time, causing fuel to leak out. If the tank is cracked, it will need to be replaced. The most common place for a leak is along one of the seams.
Another potential source of the leak could be the fuel lines, which carry fuel from the tank to the carburetor. These lines can become brittle, crack, or break, and will need to be replaced. Check the fuel line where it comes out of the tank, as this is a common place for cracks and leaks to occur.
Finally, the carburetor could be the culprit. The carburetor draws fuel in, mixes it with air, and pumps it out to the chamber. Dirty carburetors or clogged valves can cause a backup in the gas flow, leading to leaks. The carburetor can sometimes be cleaned and rebuilt, but servicing and repair are often best left to professionals.
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Replacing fuel lines
Chainsaw fuel lines can clog, crimp, or crack over time, preventing the engine from starting. To replace them, first, drain the fuel tank into an approved storage container in a well-ventilated area. Then, remove the cylinder shield using an Allen wrench. Next, detach the fuel lines from the carburetor and primer bulb using needle-nose pliers. Pull the fuel lines out of the gas tank, and cut the new fuel lines at an angle to thread them into the tank. Push the large line about one inch into the tank, and insert the small line far enough so it can be grabbed through the mouth of the tank with pliers. Pull the small line out, cut it square, and install the fuel filter. Finally, pull the line back so the filter rests at the bottom of the tank, trim the fuel lines, and connect them to the carburetor.
- Cut the end of the line to a sharp, long point, and use hemostats or a thin piece of wire to guide it through the hole in the tank.
- If you have extra fuel line, cut it in half vertically, then pull the rest through with pliers. You may need to poke the uncut side with a screwdriver.
- Try not to crimp the fuel lines when reinstalling the carburetor.
- Before refilling the tank, check that all repairs have dried or cooled, then sand the area with fine-grit sandpaper for a smooth finish.
- After refilling the tank, check for leaks by placing a white cloth underneath and observing for any wet spots within an hour.
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Repairing a cracked fuel tank
Before beginning the repair, it is important to have a basic understanding of chainsaw components and their functions. Additionally, ensure that you have the necessary tools and safety equipment, as repairs can be hazardous if not performed correctly.
Start by draining the fuel tank and allowing it to dry completely. This is crucial to ensure that no fuel comes into contact with the repair materials. Once the tank is dry, use sandpaper to roughen the surface around the crack. This will help create a better adhesion for the repair compound. Clean the area thoroughly to remove any debris or residue.
Apply a specialized epoxy or weld designed for fuel tanks onto the cracked area. These specialized products are important as regular glue will not withstand fuel exposure and pressure. Follow the instructions on the product you are using, and ensure that the repair is thoroughly cured and dried.
Once the repair compound has dried, use fine-grit sandpaper to sand the area for a smooth finish. Reassemble your chainsaw, but before turning it on, fill the tank with a small amount of fuel and check for leaks. Place a white cloth underneath the tank to easily spot any drips or wet spots. If no leaks are detected within an hour, your repair is likely successful.
If you are unsure about the extent of the damage or feel uncomfortable performing the repair, it is best to consult a qualified technician or consider replacing the fuel tank altogether. Safety should always be a top priority when working with power tools and flammable substances.
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Replacing the carburetor
If your chainsaw engine won't start even with a full tank of fresh fuel, the carburetor could be the problem. To test this, remove the air filter and pour a teaspoon of fuel into the carburetor. Pull the starter rope and if the engine starts and then dies, the carburetor is likely faulty.
Before replacing the carburetor, you could try cleaning it. This can be done by pulling the carburetor and soaking it in a Chem-Dip carb cleaner overnight, then reassembling it the next day. However, if you are short on time, or this does not work, you may need to replace the carburetor.
To replace the carburetor, first, drain the fuel tank into an approved storage container. Next, using an Allen wrench, remove the screws that hold the cylinder shield to the engine. Slip the new carburetor onto the mounting studs and push it into place. Position the air filter housing on the protruding studs and replace the mounting nuts, tightening them to seal the gasket between the engine and the carburetor.
Finally, position the air filter in the housing and replace the cover. Reattach the spark plug wire and reinstall the cylinder shield. Refill the fuel tank and you are done!
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Frequently asked questions
First, check the gaskets, primer bulbs, and fuel tank. Gaskets are designed to create a seal to prevent fuel from leaking out of the fuel tank. If the gasket is worn or damaged, the seal will not be created and fuel can leak out. In some cases, the gasket is simply an O-ring inside the fuel cap that creates the seal. A damaged or missing gasket will need to be replaced.
Your chainsaw’s fuel lines run from the tank to the carburetor and are designed to transport fuel. They are often made of either rubber or plastic, and therefore can crack and break. Cracked and leaking fuel lines will need to be replaced. This is something of an urgent repair, as cracked/leaking fuel lines pose a fire hazard.
If you didn't draw any of the oil from the tank into the fuel lines, you might not have much trouble at all. Just swish straight gas around in the tank and dump it out. If there was fuel left in the tank, it might be smoky on startup.
It’s best done in moderate temperatures as extreme cold can affect curing times and material flexibility.
