To date I have just had my 4th fuel pump installed by the dealership under warranty. Clearly there is a problem with the design of the fuel system on the Red Sport. Looking at the Q50 forum, there is a picture of the gas tank which makes the problem easier to understand, if the Q50 and Q60 do in fact share the same gas tank design. Maybe someone can chime in. This also points out the fact that there should be no hard acceleration under 1/4 tank. I think what happens is that with repeated starvation of fuel that the output of the pump fails after a while. I will probably upgrade to an AMS pump for future reliability.
View attachment 26563