
The fuel line is an essential component of a trimmer, responsible for delivering fuel from the tank to the engine. Over time, the fuel line can deteriorate, leading to cracks and leaks. This can cause issues with the trimmer's performance and fuel efficiency. Replacing the fuel line is a common repair task for trimmer owners, and it can be done at home with relative ease. This article will specifically focus on the fuel line connection for the Craftsman 358791580 trimmer, providing a step-by-step guide to ensure a proper connection and optimal trimmer performance.
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What You'll Learn
- The fuel line with the strainer connects to the top of the carburettor
- The lower hose on the carburettor connects to the primer bulb
- A second primer bulb hose returns to the fuel tank
- The primer bulb sucks fuel through the carburettor and expels the discharge back to the tank
- The fuel line is responsible for supplying fuel from the tank to the engine

The fuel line with the strainer connects to the top of the carburettor
The fuel line with the strainer is an important component of the trimmer's fuel system. It is designed to filter the fuel before it enters the carburettor, removing dust and other suspended particles. This helps to prevent blockages in the fuel nozzle, ensuring a consistent fuel supply to the engine.
To replace the fuel line with the strainer, you will need to access the entire fuel system by removing the fuel system cover and any fasteners holding the carburettor in place. Once you have removed the old fuel line, you can install the new, filtered fuel line by connecting it securely to the inlet of the carburettor.
It is crucial to ensure that the fuel line is installed correctly and securely. Any kinks, leaks, or blockages in the line can lead to engine problems, including poor fuel delivery and stalling. Additionally, it is recommended to replace the fuel lines every few seasons as they can deteriorate over time, becoming brittle and cracked.
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The lower hose on the carburettor connects to the primer bulb
The fuel lines of a trimmer connect the fuel tank, primer bulb, and carburettor. The lower hose on the carburettor connects to the primer bulb. This is an important part of the trimmer's fuel system, as the primer bulb helps to fill the carburettor with the correct amount of fuel.
When performing a fuel line repair, it is likely that the plastic fuel lines are cracked due to age or wear. The fuel lines and primer bulbs are usually the same age, so if one cracks, the other is likely to follow soon. It is recommended that you replace both at the same time to save money on shipping.
The primer bulb is often located on or near the engine's carburettor. To replace the primer bulb, you must first access the carburettor by removing the fuel system cover. Then, remove the old primer bulb by unscrewing the screws that mount the primer bulb plate to the carburettor. Be prepared for some gas to leak out. Once the primer bulb plate is removed, the old primer bulb should easily pop out of the mount plate.
The new primer bulb can then be pressed into place in the mount plate. Before screwing the primer bulb plate back into place on the carburettor, the carburettor must be cleaned and the disassembled pieces must be reassembled in the correct order.
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A second primer bulb hose returns to the fuel tank
The fuel lines of a trimmer connect the fuel tank, primer bulb, and carburetor through several holes in the choke plate. The primer bulb hose/line can be found on the right side of the carburettor. It is the primer return line.
The primer bulb hose is one of two fuel lines that connect the fuel tank, primer bulb, and carburettor. The other line is the main fuel line that holds the fuel filter in the tank. The primer bulb hose is the thicker of the two lines. It is cut at an angle and pulled through the gas cap opening. It is then cut squarely and installed on the right side of the carburettor. The fuel filter should rest at the bottom of the tank. The primer has two nipples and uses the thicker line, with one long and one short. The long nipple is the tank return line and enters the tank on the right side.
The primer bulb hose is important because it pulls fresh fuel from the fuel tank to the carburettor and then pushes any air or old fuel back into the fuel tank. If the primer bulb hose is not functioning properly, it can cause the engine to stall. Therefore, it is important to inspect and replace the primer bulb hose regularly, as part of the trimmer's maintenance.
The trimmer's fuel system can be removed by first removing the fuel system cover, which is usually located on the rear of the engine. Any fasteners that affix the cover to the engine should be removed to access the carburettor. The throttle cable should then be released from the carburettor. Finally, the fuel tank, carburettor, fuel lines, and carburettor mount plate can be removed together. It is important to note that the fuel lines should be tightly attached to their fittings. When removing the old fuel lines, a flat-head screwdriver can be used to avoid breaking them.
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The primer bulb sucks fuel through the carburettor and expels the discharge back to the tank
The primer bulb is a small pump that pulls fuel through the carburettor from the tank supply line and filter, and then returns it to the tank. This process is known as "purging", where the bulb sucks the air out of the system and replenishes it with a fresh charge of fuel. The discharge has nothing connected to it inside the fuel tank.
The primer bulb is connected to the carburettor by a clear plastic line without a filter. The fuel line and filter are available at most places that carry outdoor power equipment parts, but it is important to ensure that the line is the exact size as the original. The primer bulb sucks fuel from the tank via the line with the filter on the end, and the fuel returns to the tank via the other line without the filter.
The fuel lines of the trimmer connect the fuel tank, primer bulb, and carburettor through several holes in the choke plate that allow them to pass between. The choke plate, carburettor, and fuel tank need to be removed from the trimmer by releasing any fasteners. The trimmer fuel lines attach to fittings on the carburettor and primer bulb. When installed correctly, the fuel lines should be attached tightly to their fittings.
The primer bulb is used for priming, and the other line feeds the engine while running. The bulb should not be full of fuel when running. If there is no fuel in the bulb, the check valve in the primer is bad, and it is not drawing air in through the discharge port.
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The fuel line is responsible for supplying fuel from the tank to the engine
In the case of the Craftsman 358791580 trimmer, the fuel line is known to deteriorate over time and can eventually split or crack. This is a common issue with trimmers, as the plastic fuel lines break down and become brittle if they are not replaced every few seasons.
To replace the fuel line, you will need to remove the trimmer's fuel system. This will involve disassembling the trimmer to access the entire fuel system. The fuel tank, carburetor, fuel lines, and carburetor mount plate will come off together. You will need to remove any fasteners that affix the cover to the engine, and then release the throttle cable from the carburetor.
Once the fuel system is removed, it is important to inspect and diagram the fuel line setup before continuing. The fuel lines connect the fuel tank, primer bulb, and carburetor through several holes in the choke plate. The fuel line with the filter attached goes from the carburetor to the tank, and the other line goes from the primer bulb to just inside the tank.
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Frequently asked questions
The fuel lines of the Craftsman 358791580 trimmer can split or crack over time.
First, drain any remaining fuel from the trimmer's tank. Then, carefully remove the clamps or fittings that secure the fuel lines to the tank.
Thread the new fuel lines through the appropriate openings in the trimmer's housing, ensuring they are properly connected to the fuel tank and
A small fuel line replacement with a 9/64-inch outer diameter and a 6/64-inch inner diameter is available.











































