Fuel pump test for s4 ducati - 2003 Ducati Monster S4

Your fuel pump is vacuum operated, I would look for a crack in the rubber somewhere. Also, the side stand, the bike will start with it down, but will shut off the second you put it in gear. I have a 2002 S4.

That is not the fuel pump you hear, the pump is vacuum and the noise you hear is the ignition coming to life. Don't use any additives in your fuel, bad news, and just use the choke only, twisting the throttle does nothing till the engine starts. The choke is a slow speed jet. There is no way to check the air filter without pulling the seat and lifting the tank. But I have never found mine dirty, and I live on a dirt road. I call it the multistrada. 02 ,S4. Are you burning high test? 92 octane? How about keeping it warm or under cover? I think the fuel problem might be the dampness, humidity, etc, How about them spark plugs? Check them lately? I switched to autolites, they work a lot better than the champions. Hope this helps.