Replacing Husqvarna 435 Fuel Filter: Step-By-Step Guide

The fuel filter on a Husqvarna chainsaw is an essential component that ensures the long-term, efficient operation of the machine by blocking dirt, oil and woodchips from getting into the fuel line. Replacing the fuel filter is a straightforward, inexpensive task that can be completed in a few minutes. This guide will outline the steps to replace the fuel filter on a Husqvarna 435 chainsaw, as well as provide links to relevant service manuals and parts lists.

Husqvarna 435 Fuel Filter Replacement Guide

Removing the old fuel filter

To remove the old fuel filter from your Husqvarna 435 chainsaw, follow these steps:

Firstly, empty the gas tank by running the chainsaw until the engine cuts out. Next, disconnect the fuel line from the carburetor, which is located at the rear of the saw, near the throttle. On some models, you may also need to remove the air filter. Do not use knurled pliers for this step, as they could damage the hose and lead to leakage. Instead, use a suitable pair of pliers with a plain cutting face, or simply pull the fuel line out with your hands. Pull the fuel hose out of the tank unit and remove the old fuel filter. It may take a few tugs to get it loose. Dispose of the old fuel filter responsibly.

Now that the old fuel filter has been successfully removed, you can install a new one.

Disconnecting the fuel hose

To disconnect the fuel hose on a Husqvarna 435 chainsaw, follow these steps:

Firstly, it is important to note that you should not use knurled pliers to disconnect the fuel hose as this could damage the hose and lead to leakage or fracture. Instead, use suitable pliers with a plain cutting face.

Now, to begin disconnecting the fuel hose:

• Empty the gas tank by running the saw until the engine cuts out.
• Disconnect the fuel line from the carburetor, which is located at the rear of the saw, near the throttle. On some models, you may need to remove the air filter, but you should not have to disassemble the throttle.
• Pull the fuel hose out of the tank unit using pliers. Pull it far enough so that the old fuel filter comes out of the tank.
• Remove the old fuel filter by pulling it off. You may need to tug a few times to loosen it.
• Dispose of the old fuel filter appropriately.

At this point, you have successfully disconnected the fuel hose and removed the old fuel filter. Now you can install a new fuel filter and reconnect the fuel hose. Remember to exercise caution when working with gasoline and other flammable materials.

Installing the new fuel filter

To install the new fuel filter in your Husqvarna 435 chainsaw, follow these steps:

Firstly, ensure that you have purchased the correct fuel filter for your model of chainsaw. The correct fuel filter for the Husqvarna 435 is part number 503443201. This can be purchased as part of a kit, along with the required fuel line.

Now, fit the new fuel filter. You may need to use a special tool (part number 502 50 83-01) to do this. Feed the fuel hose back into position, being careful not to use knurled pliers as these could damage the hose and lead to leakage.

Once the new fuel filter is in place, you will need to replace the return hose. Loosen the hose from the fuel tank using suitable pliers with a plain cutting face. When assembling, align the cut-out against the plastic pin.

Finally, snap the purge into the filter holder and assemble the air filter and cylinder cover.

Replacing the fuel hose

To replace the fuel hose on a Husqvarna 435, 435E or 440E chainsaw, follow these steps:

Firstly, do not use knurled pliers to disconnect or reconnect the fuel hose, as this could damage the hose and lead to leakage or fracture. Instead, use suitable pliers with a plain cutting face. Now, remove the fuel hose (B) from the outside of the fuel tank, as it is moulded and can only be removed from the outside. Loosen the hose from the fuel tank with the pliers, and when assembling, align the cut-out against the plastic pin. Replace the return hose when required.

Next, dismantle the cylinder cover and the air filter. Loosen the suction hose (C) and the return hose from the fuel pump. You can refer to Figure 31 in the Husqvarna 435 Workshop Manual for a visual guide. Unsnap the fuel pump from the filter holder. Fit the return hose onto the fuel pump.

Now, snap the purge into the filter holder. You can refer to Figure 51 in the Husqvarna 435 Workshop Manual for a visual guide. Finally, assemble the air filter and cylinder cover.

Replacing the air-purge

To replace the air-purge on your Husqvarna 435 chainsaw, follow these steps:

Dismantle the cylinder cover and the air filter.

Use appropriate tools to carefully dismantle the cylinder cover and set it aside, making sure not to lose any small parts. Then, locate and remove the air filter, which is likely secured by clips or screws.

Loosen the suction hose and return hose from the fuel pump.

Identify the suction hose (C) and the return hose. Using suitable pliers, carefully loosen their connections to the fuel pump. Be cautious not to damage the hoses, as this could lead to leakage or fracture.

Unsnap the fuel pump from the filter holder.

Gently unsnap or detach the fuel pump from its filter holder. This will give you better access to the components for the next steps.

Fit the return hose on the fuel pump.

Take the return hose that you loosened earlier and securely fit it back onto the fuel pump. Ensure that all connections are tight to prevent any fuel leaks.

Snap the purge into the filter holder.

Obtain the replacement purge and snap it firmly into the filter holder. Refer to Figure 51 in the Husqvarna 435 Workshop Manual for a visual guide to this step.

Assemble the air filter and cylinder cover.

Retrieve the removed air filter and carefully assemble it back into its housing. Then, attach the cylinder cover securely, ensuring all components are correctly aligned and fastened.

By following these detailed steps, you will have successfully replaced the air-purge on your Husqvarna 435 chainsaw, ensuring its optimal performance and fuel efficiency. Remember to consult the Husqvarna 435 Workshop Manual for additional diagrams and information if needed.

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