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how to clean the filter of my 2007 kawasaki nomad 1600
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Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, for a Kawasaki Nomad 1600, the fuel filter is an integral part of the fuel pump and pressure regulator assembly.
The prescribed approach for a clogged fuel filter and/or pump screen is replacement of the fuel pump assembly as the filter and screen are built into the pump and cannot be cleaned nor even checked.
I realize that the above information may perhaps be not what was expected. Unfortunately, it is a design limitation/restriction; sorry for having to be the bearer of bad news.
The air leak noise, likely more like a hissing sound would be normal and in most instances can be heard near the tank particularly at the tank cap. It would be the vent ports releasing pressure inside the tank that has developed due to heat.
On the California model, the breather hose is tied to an evaporative canister system in compliance with the Clean Air Act.
To confirm source of air leak noise, open the tank cap to release the pressure.
Then possibly wind noise.
Consider changing the positions of the lower and upper portions of the shield.
Sorry but not hearing/seeing it, I would have to rely on your descriptions.
...and we would be back to vent/breather noise. If not from the cap then check underneath the fuel tank.