Like Shaun: best check the relay first. But if it is the pump, I have the following notes collected from the Yahoo list:
1. "The pump is a Walbro MSS166."
2. "I have recently fitted a Walbro fuel pump and found that they were also fitted to the Renault Clio from 1990-1996*. Cost 25 euros
from my local breakers."
* As well as loads of other things apparently: just type 'Walbro MSS166' into Google ...
3. "I fitted '93-'98 2.2lt Toyota Camry fuel pump. It draws far less current, maintains full system pressure and was easy to adapt to the original housing. I only needed to turn up a nylon sleeve to fit it all up within an hour or so. Moves 100% more volume draws 50% less current, is more reliable, Bike certainly runs better/smoother."
HTH
Craig