Noisy fuel pump

[BikerBoy]

2 weeks from the time my fuel pump started whining it's now causing problems. Under full throttle between 4500 & 7000rpm there is a very
noticeable lag in acceleration (almost like a stutter) until it gradualy gets enough fuel through and the bike starts to pick up the pace again.
After 7k there is still a loss in performance right through to 11k (full throttle only) but it doesn't cause the same stutter as the lower rpm.
Under light-medium load there is no performace loss and the fuel pump does not cause any noticeable issues....except for that piercing noise!