How to install an in-line fuel filter on a Vespa ET4 scooter
Installing an in-line fuel filter will help prevent many dirty fuel issues that scooters can suffer from. It’s much easier to let a fuel filter catch impurities and change the filter than have to open up the carburetor and clean the jets.
For about $6 US and less than an hour, one can install an in-line fuel filter on their scooter. The parts should be available at your local auto parts store, local scooter shop, local motorcycle shop, or local ATV shop. If not, they can be easily ordered from online shops.
Purchase fuel line supplies
Purchase Tygon fuel line, fuel line clips, and an in-line fuel filter. They can be purchased from a local scooter shop, motorcycle shop, or an online scooter shop.
Measure correct fuel line length
It takes a minimum of 18 inches of Tygon fuel line for the Vespa ET4.
Install the in-line fuel filter
Cut the fuel line into two pieces about one-quarter of the way from the carburetor to the fuel tap. Install the in-line fuel filter so that the flow indicator on the filter matches to the fuel flow. The fuel flows from the tap to the carburetor. Attach the fuel line clips to hold the filter in place.
Disconnect the old fuel line from the carburetor
You will probably need to slide the black plastic cover off the electric choke in order to have access to the carburetor fuel inlet area. Slide or carefully remove the fuel line clip and then remove the old fuel line from the carburetor. The fuel line may have some gasoline in it. If the fuel tap has failed, expect gasoline to pour from the fuel line. Have a container or paper towels handy.
Disconnect the old fuel line from the fuel tap
The fuel tap is located underneath the gas tank. Slide or carefully remove the fuel line clip from the fuel line. Disconnect the fuel line from the tap. If the tap has failed, expect gasoline to pour from the fuel tap. Fuel tap failure is common on the Vespa ET4. Have a container and paper towels handy.
Connect the new fuel line
Connect the new fuel line back to the fuel tap and to the carburetor. Make sure the fuel filter is aligned according to the fuel flow arrow on the filter. Use the fuel clips to hold the lines in place.
Wipe up any gasoline and let the area throughly dry. Run the scooter for a few minutes and then turn off. Check for any fuel line leaks.
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