I'm sure everyones experience will vary based on the condition of their fuel tank, their fuel, and their environment. My fuel tank was new last winter. My fuel is home brew and filtered, and my fuel pickup a bit different from what most of you run, as it has a little lift pump on it. I will be taking the Holley apart, and discussing the yea/nay abilitity to repair or rebuild it. The same will be done with the Carter when the time comes. I'm sure a pre-filter would be installed if I was doing this under different conditions, but in the name of science, I guess you could say I'm inviting difficulty on purpose, as a worse case scenario is always more usefull than ideal conditions, since the theory is anything should last longer if you take care of it. My Holley problem was with the motor, and the pumping chamber was never opened or rebuilt. Aside from the shape of the pieces inside, it appears the pumping chamber of the two brands are esentially the same. It is my hope that the test will concentrate on the viability of the electric motor and major design philosophy differences between the two, rather than the pumping chambers, as that seems to be where the majority of the difference between the two is.