It might be worth changing the relays in the tail. They seem to be related in their functioning with each other and if one is a bit dicky it can affect the fuel pump - cos it happened to me!
The Ducati part seems to have changed over the years and the ones I bought had a different pin arrangement, which I sorted by swapping the pins in the socket block the relay sits in.
Then I discovered that I could get an identical relay to the original from a local motor factor for about a fiver and it saved the hassle of changing connections...
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