Katerina Swanson
The depth to which a primer tube should go into a fuel tank depends on the type of engine and the manufacturer's specifications. For example, in a 25cc craftsman leaf blower, the thinner fuel line should protrude about an inch into the tank. In contrast, for a Weed-eater, the thin fuel line enters the tank on the left side and has a fuel filter attached, while the thicker line is the return line and enters the tank on the right side. In some cases, like with the Echo GT200R string trimmer, the feed line has a fuel filter that goes all the way to the back of the tank, while the vent and return lines go about three inches into the tank. It's important to follow the specific instructions for your equipment to ensure proper functionality and avoid any potential issues.
| Characteristics | Values |
|---|---|
| How far the primer tube goes into the fuel tank | 1/4" to 1" below the fuel cap hole |
| Fuel line and return line | One thin line and one thick line |
| Where the thin line goes | From the carburetor to inside the fuel tank, attached to the filter |
| Where the thick line goes | From the carburetor if it has a primer bulb built-in or to the external primer bulb if not attached to the carburetor |
| Fuel filter position | At the back of the tank, halfway between the front and back, or at the bottom of the tank |
| Vent line | Goes about 3 inches into the tank |
| Return line | Goes about 3 inches into the tank |
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What You'll Learn
Primer tube length: 1/4 to 1 below the fuel cap hole
The primer tube length should be 1/4 to 1 inch below the fuel cap hole. This is because the thicker line, which is the fuel return/breather line, should be attached to a weighted filter inside the tank. The fuel feed line, which is thinner, connects to the filter inside the tank.
The fuel feed line should be pulled out about 1 inch from the fuel cap opening, and the filter should be attached. The line is then placed back into the tank, allowing the fuel filter/line to move freely within the tank. The fuel feed line then connects to the bottom connector on the carburetor.
The fuel return/breather line, on the other hand, should have a breather nipple attached to it inside the tank. This line should be positioned below the fuel cap hole to prevent it from being submerged in fuel when priming the carburetor.
To ensure a snug fit, it is recommended to use curved hemostats to pull the lines from the inside, and a light lubricant on the outside. Additionally, cutting the tip of the line at an angle can aid in the installation process.
It is important to note that the fuel lines on the carburetor can be confusing, so it is always recommended to refer to the specific instructions and diagrams for your equipment before attempting any repairs or replacements.
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Primer tube function: To pressurise the fuel tank
A fuel system primer is a simple mechanical device that helps to start engines on cold mornings, when vapor lock can prevent ignition. The primer tube functions to pressurise the fuel tank, which in turn bleeds the air from the system, allowing for immediate and proper fuel pressure. This is essential for the correct operation of the fuel system and efficient starting.
The primer bulb or actuator is the part of the primer that the user interacts with to operate the device. In a manual primer, this is a plunger or lever, whereas in an electric primer, it is a switch that activates a small motor or solenoid. The amount of priming fuel injected can be controlled by how far the actuator is pulled or pushed, or by the amount of time the switch is on.
The primer bulb sucks fuel from the tank, through the carburetor, and returns it to the fuel tank. This process can also be achieved with a small vacuum pump. The fuel lines on the carburetor can be confusing, but essentially, the thicker line is the fuel return/breather line, and the thinner line is the fuel feed. The fuel feed line is attached to a weighted filter inside the tank, which allows for maximum contact with the fuel.
In modern fuel-injected engines, fuel injection has eliminated the need for primers, as fuel pressure is maintained in the injection system at all times, meaning fuel is always primed and ready.
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Fuel lines: Thick and thin lines enter the tank
A fuel system is made up of several components, including the fuel tank, fuel lines, fuel filter, fuel pump, and fuel injectors or carburetor. The fuel lines are responsible for transporting fuel from the tank to the engine, where it is combusted to power the vehicle. In most fuel systems, there are two types of fuel lines: the feed line and the return line.
The feed line, also known as the fuel line, is the smaller of the two lines. It is typically made of a flexible material, such as rubber, and is designed to withstand contact with fuel. This line transports fuel from the tank to the engine, passing through the fuel filter and, in some cases, a fuel pump, before reaching the engine's fuel injectors or carburetor. The feed line is crucial for supplying a consistent and controlled flow of fuel to the engine, ensuring optimal performance and fuel efficiency.
On the other hand, the return line, also referred to as the breather line, is the thicker of the two lines. Its primary function is to return excess or unused fuel from the engine back to the fuel tank. This line helps regulate fuel pressure and prevent overloading the engine with too much fuel. It is important to note that not all vehicles have a return line, as some smaller engines may only have a feed line.
When installing or replacing fuel lines, it is essential to ensure they are securely connected to the fuel tank, fuel filter, and any other relevant components. The lines should be snug to prevent leaks and cut at an angle to facilitate insertion. Additionally, the use of grease or lubrication can aid in the installation process and help create a tight seal.
In terms of maintenance and troubleshooting, it is crucial to inspect the fuel lines regularly for any signs of damage, cracks, or leaks. Over time, fuel lines can become hard and brittle, leading to potential issues with fuel flow and engine performance. Replacing fuel lines is generally recommended if any degradation is observed, and it is advisable to consult a professional mechanic or refer to manufacturer guidelines for specific replacement instructions.
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Fuel filter: Sits halfway between the front and back of the tank
The fuel filter is an essential component of any fuel system, ensuring that impurities are removed from the fuel before it reaches the engine. The placement of the fuel filter within the tank is crucial for optimal performance and can vary depending on the specific application. In the case of a weed eater, for instance, the fuel filter should be positioned inside the tank, attached to the thinner fuel line. This line, which serves as the fuel feed, should be cut at an angle and inserted about one inch into the tank through the fuel cap opening.
In some cases, the fuel filter may be placed further back within the tank. For example, the Echo GT200R string trimmer's feed line positions the fuel filter at the very back of the tank. However, this setup can lead to fuel leakage, as experienced by the user who posted about it. To rectify this issue, another user recommended cutting the fuel filter line so that the filter sits halfway between the front and back of the tank. This adjustment allowed the machine to run through an entire tank of gas without any issues.
The position of the fuel filter line affects the accessibility of the filter for maintenance or replacement. By having the filter line reach halfway, it is easier to pull out the filter for servicing or replacement. Additionally, this position ensures that the filter can always reach the fuel, regardless of the machine's orientation.
It is important to note that the fuel filter should be weighted so that it always falls to the bottom of the tank. This ensures that it remains submerged in the fuel, allowing for effective filtration and minimizing the chances of engine issues caused by impure fuel.
To summarize, the fuel filter's position halfway between the front and back of the tank is a balanced solution that offers both functional and maintenance benefits. This placement allows for adequate fuel filtration, accessibility for servicing, and the ability for the filter to reach the fuel regardless of the machine's position.
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Fuel return line: Goes about three inches into the tank
The fuel return line is one of the two fuel lines that come from the fuel tank. The other is the fuel feed line, which is thinner than the return line. The return line is also known as the breather line.
The fuel return line should go about 1 to 3 inches into the tank. The exact length is not critical. However, it is important that the line is snug in the tank, as it will shrink over time, and if it is too loose, it will leak.
The fuel return line is connected to the primer bulb. It is the line closest to the bulb. The other line, the inlet, is further from the bulb and is attached to a weighted filter.
The fuel return line feeds directly into the tank and has a breather valve attached to the end when inside the tank. This valve should not be submerged in fuel when priming the carburetor.
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Frequently asked questions
The thinner line of a leaf blower, which is the fuel feed, should be protruding about an inch deep into the tank.
The thin line of a weed-eater, which is the fuel feed, should be pulled out about 1" from the fuel cap opening.
The thin line of a Poulan Wild Thing, which is the main fuel line, enters the tank on the left side and has the fuel filter on it. Cut the line on an angle and push it into the tank. Pull it through the fuel cap opening and cut it squarely.
The feed line of a string trimmer, which is the main fuel line, should be long enough to reach the fuel regardless of how you hold the machine. The vent and return lines go about three inches into the tank.
