When refueling from canisters, it is recommended to filter the fuel with a clean cloth.
The fuel pump does not require any maintenance other than the fact that every 30,000 km it is necessary to remove and clean the mesh located in the upper part of the pump.
The air filter insert must be cleaned every 15,000 km and replaced every 30,000 km.
On the carburetor, the idle adjustment should only be checked from time to time and possibly adjusted to adjust the idle and engine transients to weather or local conditions.
Changing basic carburetor settings made at the VW factory by replacing jets, etc. almost always lead to a change in work and should not be done also from the point of view of the composition of the exhaust gases.
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