VFR 800 FI no longer starts at once

My VFR 800 (RC46, 1999) ran 2 years and 10,000 km reliably, now it doesn’t start at once anymore. – Gasoline pump buzzes when you turn on ignition + RUN – starter spins the engine vigorously, battery good – No ignitions – spark plugs unscrewed > light petrol-moist, ignition spark ok That’s the first VFR with injection. With carburetor I would now be completely perplexed, so I guess on an injection problem: – Petrol pressure? – ECU? What is the most obvious Ursac? who has some experience of how to best circle the problem?