I've had the fuel pump out again today. Two reasons. One, so I could bend the wire the float was on so as to make the gauge register more accurately (blimey, it's a stiff wire) and two, so I could re-seal the join between the pump and the tank. I put it together 'dry' back in January, and the rubber seal seemed to be OK on its own, but the other day I filled the tank as full as it would go to make the most of a 5p a litre off voucher and noticed a small leak. It's fixed together with gasket compound to help it now. I'll let it solidify for a day or two and then fill the tank right up to see if it is any better.