Rajan Wilcox
The fuel system on a walk-behind or riding lawnmower may have a fuel shutoff switch or valve in the fuel line. This switch is usually located at the base of the fuel tank, where the fuel line connects to the tank. The switch is intended to stop gasoline from leaving the fuel tank and going to the mower's engine. The fuel line should be made of a rubber suitable for fuel and emissions use.
Where is the fuel line on a lawn mower?
| Characteristics | Values |
|---|---|
| Location | Usually located at the base of the fuel tank where the fuel line connects to the tank |
| Function | Stops gasoline from leaving the fuel tank and going to the mower's engine |
| Fuel Line Hose Material | Rubber suitable for fuel/emissions use |
| Fuel Line Hose Diameter | 1/4 or 3/16" inside diameter hose |
| Fuel Line Hose Colour | Black |
| Fuel Line Hose Length | 2 ft. |
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What You'll Learn
Fuel shutoff switch or valve
Many lawn mowers have a fuel shutoff switch or valve in the fuel line. This switch or valve is designed to stop gasoline from leaving the fuel tank and reaching the engine. If your mower has a fuel shutoff, you can typically find it at the base of the fuel tank, where the fuel line is connected to the tank. Depending on the model of your mower, you may need to turn the shutoff a half-turn or one or more full turns to cut off the fuel supply.
The fuel shutoff is an important feature that can prevent issues with your mower's carburetor. By turning off the fuel supply, you can prevent gasoline from entering the carburetor and causing issues such as gumming or varnishing. This is especially important if you plan to store your mower for an extended period or if you need to make repairs to the engine.
In addition to preventing carburetor issues, the fuel shutoff can also help to reduce fuel evaporation and the associated odour. It can also save you time and money by preventing fuel from entering the engine crankcase and mixing with the oil in the event of carburetor needle and seat failure.
While some people choose to run their mower's engine dry before storage, a fuel shutoff valve offers a convenient alternative. It allows you to keep the fuel in the tank while preventing it from reaching the carburetor and engine. This can be especially useful if you plan to store your mower for a shorter period of time or if you use your mower infrequently.
Fuel shutoff valves are available for purchase online and can be installed on your lawn mower. They are typically inexpensive and can be a worthwhile investment to protect your mower's engine and carburetor. Remember to turn the valve on and off each time you use your mower to ensure its effectiveness.
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Fuel line hose material
The fuel line on a lawn mower is usually located at the base of the fuel tank, where the fuel line connects to the tank. It may also have a fuel shutoff switch or valve in the fuel line.
Now, when it comes to the fuel line hose material, it's important to choose a suitable option to ensure the safe and efficient operation of your lawnmower. Here are some key considerations and recommendations:
Material Selection:
- Rubber: It is recommended to use a hose made of rubber that is specifically designed for fuel and emissions applications. This type of rubber hose is suitable for small engines and can withstand the demands of fuel systems. Look for markings on the hose indicating its suitability for fuel/emissions use, along with the inside diameter specifications. Typically, small engine fuel lines have an inside diameter of 1/4 or 3/16 inches.
- Polyurethane: While clear PVC lines are available, it's important to note that PVC is generally not suitable for use with fuel. Instead, opt for translucent greenish hoses, which are often made of polyurethane. These hoses are more flexible and allow you to see the fuel moving through them during priming.
- Compatibility: Ensure that the hose material is compatible with the type of fuel your lawn mower uses, whether it's gasoline, diesel, or a mix of both.
Durability and Maintenance:
- Durability: Consider the durability of the hose material. Black rubber fuel hoses, for example, tend to last longer than translucent hoses. Choose a material that can withstand the environmental conditions and the frequency of use.
- Degradation: Be aware that some materials, like translucent hoses, may degrade faster than others. Consider the expected lifespan of the hose material and plan for potential replacements.
- Flexibility: Opt for a hose material that offers sufficient flexibility. This will make it easier to work with and install, especially when navigating tight spaces or connections.
Safety and Performance:
- Quality Testing: Look for fuel lines that have been quality tested for fitment, safety, and performance. This ensures that the hose can handle fuel flow and pressure without leaking or failing.
- Permeation Resistance: Choose a fuel line with low permeation properties. This feature helps prevent fuel vapors from escaping, reducing emissions and minimizing safety hazards.
- Outside Diameter: Pay attention to the outside diameter of the hose. Ensure that it matches the connections and fittings of your lawn mower's fuel system to prevent leaks and improper installations.
Some popular options for lawn mower fuel lines include the Arnold Low Permeation Fuel Line for Lawn Mowers (GL-024) and the YAMAKATO 1/4 Inch ID Fuel Line Hose, both of which are available at home improvement stores and online retailers. Remember to always follow the manufacturer's recommendations and safety guidelines when selecting and installing a fuel line hose for your lawn mower.
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Fuel filter
A fuel filter is an essential component of a lawn mower's fuel system, ensuring the proper functioning of the engine. It is designed to strain the gas before it reaches the carburetor, preventing debris from reaching the carburetor and disrupting the gas-air mixture, which could lead to poor engine performance.
The location of the fuel filter can vary between different models of lawn mowers. Typically, it is located either inside the fuel tank or fitted into the fuel line between the tank and the fuel pump. Some lawn mowers have internal, non-serviceable fuel filters, which cannot be replaced. The replaceable fuel filters usually come in two styles: canister-style and tube-style. The canister-style filter is a small plastic canister with pleated material inside, often transparent, and it connects to one end of the fuel line. The tube-style filter, on the other hand, is thin and straw-like, with a fine mesh at one end, and it slides inside the fuel line where it connects to the gas tank.
To check and clean a lawn mower fuel filter, it is important to work in a safe area, free from open flames or fire sources. Wear safety eyewear to protect your eyes from fuel or fuel vapors. Begin by draining the gas from the tank or running the mower dry outdoors. Disconnect the wire from the spark plug to prevent accidental engine startup during the process. Locate the fuel line and use pliers to release the spring clips holding the line to the gas tank spigot and filter. Pull the fuel line off the spigot and remove the filter.
For canister-style filters, inspect the pleated material inside for any debris or severe discolouration. If the filter is clogged or discoloured, it needs to be replaced. Unfortunately, canister-style filters cannot be conveniently cleaned. Tube-style filters, on the other hand, can be carefully rinsed with water if there is visible dirt or debris inside. Ensure that you reinstall the filter in the correct direction, usually indicated by an arrow on the casing, pointing in the direction of fuel flow.
It is recommended to check and clean or replace the lawn mower fuel filter at least once a year or after each mowing season. A well-maintained fuel filter can help prevent unexpected breakdowns and ensure the optimal performance of your lawn mower.
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Installation and removal
Before installing or removing a fuel line, it is important to familiarise yourself with the underside of your lawnmower and its fuel system. The owner's manual for your lawnmower should be consulted, as most manuals can easily be found online.
To begin any maintenance, ensure the machine is unplugged or turned off. Remove the spark plug lead, and secure it from coming into contact with the plug. If your lawnmower has a fuel valve, turn it to the "off" position. Fuel valves are often located at the base of the gas tank, where the fuel line meets the tank. If there is no fuel valve, clamp the fuel line to prevent gas from flowing.
When installing a new fuel line, ensure that the hose is not clogged with dirt or particles, as these can damage the engine. Install new clamps onto each end of the hose, then install the hose over the fittings, securing it with the clamps. Upon first use, check for leaks. If fuel is leaking, stop the engine and re-secure the hose and clamp.
When removing a fuel line, it is important to first empty the line. After removing the mounting screws and pump from the carburetor, empty the line and check for any damage. If the tank has any hairline cracks or is damaged in any way, do not attempt to repair it—the tank should be replaced to avoid injury. Check the line for any debris, holes, or cracks, and replace any lines that are too damaged to use again.
It is worth noting that small engine fuel lines are typically 1/4 or 3/16" inside diameter hose, and should be made of rubber suitable for fuel/emissions use.
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Fuel leaks
First, you should check the fuel tank for any damage. Fuel tank cracks are usually the result of an accident, such as the tank hitting a low-hanging shrub branch or something falling on the lawnmower. If the tank is exposed, you can simply remove the fuel line from it and then remove the tank from its mounting. If the tank is under the engine shroud, you will need to remove the shroud and possibly the starter assembly to access the tank.
Next, check the fuel lines for any cracks or tiny holes. Fuel lines can become damaged or disconnected, causing fuel to leak. Ensure that the fuel lines fit tightly on the fuel pump and the fuel shut-off valve. If you find any cracks or holes in the fuel lines, or if the fuel shut-off valve is leaking, you will need to replace the affected parts.
The carburetor is another common source of fuel leaks in lawn mowers. Fuel leaking from the bottom of the carburetor may be due to a dried out or missing float bowl gasket. The metering needle inside the carburetor can also become stuck in the open position, causing fuel to overflow from the bowl and leak out of the carburetor. If the carburetor is leaking, you may need to clean, rebuild, or replace it.
Other potential causes of fuel leaks in lawn mowers include a clogged fuel cap, bad spark plug, or a fuel shut-off solenoid leak. It is important to refer to the specific instructions in your lawn mower's manual for further troubleshooting and repair guidance.
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Frequently asked questions
You should use a hose made of rubber suitable for fuel/emission use. The inside diameter of the hose should be 1/4 or 3/16 inches.
PVC is not suitable for use with fuel. It will degrade much faster than a black rubber fuel hose.
The fuel line is usually located at the base of the fuel tank.
The switch is intended to stop gasoline from leaving the fuel tank and going to the mower's engine.
You should close the fuel shutoff if you are making repairs to the engine or do not plan to use the mower anytime soon.
