The cap seals the fuel tank of the Partner 350 chainsaw. It usually has a pressure-equalizing channel so that fuel flows freely to the carburetor.
Replace it if fuel leaks, the seal is worn, the body is cracked, or the saw stalls because of vacuum in the tank. When replacing, check the tank neck.
Before buying, check your saw model: for Chinese saws and their analogues, parts of different generations may differ, so rely on the marking and comparison with the old part.
