Hi! My 75 does the same. But... yesterday I've replaced my fuel filter and guess what? This weird whining noise just dissapeared. No matter if engine is cold or warm - there is just no whining sound! But after a 50km on new filter the whining sound got back ;/
This sound is only on overrun, so pobably engine is not using any fuel at this moment. My both filters (the previous one and the current one) is made by Knecht.
I'll probably change my fuel filter to another brand, maybe MANN. What do you think? What filters do you use?
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