Mercedes Mullins
The Poulan Pro PP4218AVX chainsaw uses two fuel lines with dimensions of 3/32id by 3/16od and .080 id by .140od. The inlet line is smaller than the return line. The fuel lines are responsible for carrying fuel to the carburetor, and over time they can clog, crimple, or break, which limits the fuel flow and makes it difficult for the engine to start. Replacing the fuel lines is not a difficult task but it does require some tricky steps and the right tools.
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What You'll Learn
The Poulan 4218 uses 3/32id by 3/16od and .080 id by .140od fuel lines
The Poulan 4218 chainsaw uses two fuel lines with different dimensions: 3/32"id by 3/16"od and .080" id by .140"od. The smaller .080" id by .140"od line is where the fuel filter is mounted, and it runs through the hole on the left and then over to the right side of the carburetor to the fuel inlet nipple. The inlet line is a lot smaller than the return line, and the fuel filter should always be on the bottom of wherever the fuel is resting.
When replacing the fuel lines, you should first drain the fuel tank, then take out the spark plug wire, air filter, and housing. Next, remove the carburetor and disconnect the old lines using needle-nose pliers. Put the new line in the tank on one side and take it out from its opening on the other side. Place the fuel filter and pull out the line from the tank until the filter is in place. Finally, install the lines back on the carburetor and primer bulb, then reinstall the carburetor and reattach the spark plug wire, air filter, and housing.
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The inlet line is smaller than the return line
The Poulan Pro PP4218AVX chainsaw has two fuel lines that need to be replaced periodically. The inlet line is smaller than the return line. The inlet line is the smaller of the two fuel lines and connects the fuel tank to the carburettor. The return line, also known as the push line, returns excess fuel from the primer bulb to the fuel tank.
The inlet line has a diameter of 0.080" ID by 0.140" OD, while the return line has a diameter of 3/32" ID by 3/16" OD. The fuel filter is mounted on the inlet line, which runs through the left hole in the tank and then to the right side of the carburettor. The return line has a tiny nipple that looks like a coupling for two pieces of hose. This nipple is not necessary for the function of the saw, but it helps to hold the fuel line in place and keep the fuel level fixed.
When replacing the fuel lines, it is important to ensure that the lines are the correct size and fit snugly through the holes in the tank. The lines can be cut at an angle and forced through with forceps. It is also important to note that the main fuel line is visible on both sides, but the other end of the primer is buried and difficult to see.
The fuel lines in a Poulan chainsaw are responsible for carrying fuel to the carburettor. Over time, they can become clogged, crimped, or broken, restricting fuel flow and making it difficult for the engine to start. Replacing the fuel lines is not a difficult task, but it does require some tricky steps and should be done in a ventilated space.
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The fuel filter position may cause issues
The Poulan Pro PP4218AVX chainsaw uses 3/32"id by 3/16"od and .080" id by .140"od fuel lines. The inlet line is smaller than the return line. The fuel filter position may cause issues. If the main line is too long or too short, it could cause the chainsaw to run erratically when positioned flat. This is because the fuel filter may be curled up halfway along the vertical wall of the tank, causing the filter to be submerged when the chainsaw is positioned flat. However, when the chainsaw is turned on its side, the fuel filter is submerged, and the chainsaw runs smoothly.
The fuel filter position issue may be unique to the Poulan Pro PP4218AVX chainsaw as the fuel tank is a big box with nowhere for the filter or the line to bind up. In other chainsaws, the filter could get bound up if the main line is too long or too short. However, this is not an issue in the Poulan Pro PP4218AVX.
The fuel line routing can be found on YouTube, and the vent/return line should be placed just inside the top of the tank. The fuel line from the tank goes into one nipple on the carb, and the suck side line from the primer goes to the other side of the carb. The push side line of the bulb is a return line that pushes excess fuel back into the saw's fuel tank. The fuel line can be cut at an angle and left just inside the tank to prevent it from popping out.
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The fuel line from the tank goes into the carburettor
The Poulan 4218 chainsaw uses two fuel lines with dimensions of 3/32"id by 3/16"od and .080" id by .140"od. One of these lines is connected to a fuel filter inside the fuel tank, while the other is a vent. The fuel line from the tank goes into the carburettor, while the second line is a return line for the primer.
The inlet line is smaller than the return line, and it is important to ensure that the line seals tightly. To achieve a tight seal, cut an angle in the hose and use forceps to pull it through. The fuel filter position is also important, as an improperly positioned filter can cause the chainsaw to run erratically. The filter should always be on the bottom of wherever the fuel is resting, ensuring that it does not bind up.
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The fuel line replacement process takes less than an hour
The Poulan 4218 chainsaw uses two fuel lines with different diameters: 3/32"id by 3/16"od and .080" id by .140"od. The inlet line is smaller than the return line. The fuel lines can be replaced in less than an hour by following these steps:
First, drain the fuel tank and remove the spark plug wire, air filter, and housing. Then, take out the carburetor and disconnect the old lines using needle-nose pliers. It is important to have the correct size of fuel line, which must fit very snugly through the hole in the tank. Next, put the new line in the tank on one side and take it out from its opening on the other side. Place the fuel filter and pull out the line from the tank until the filter is in its place.
After that, install the lines back on the carburetor and primer bulb. The fuel line from the tank goes into one nipple on the carburetor, and the 'suck side' line from the primer goes to the other side of the carburetor. The 'push side' line of the primer bulb is a return line that pushes excess fuel back into the saw's fuel tank. Finally, reinstall the carburetor and reattach the spark plug wire, air filter, and housing.
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