That's the theory the filter suppliers punt out for sure. Having spoken to a number of old wagon drivers the filters used to clog within less than one tankfull of bad fuel in the old days. These days that just doesn't happen. Fuel quality is much more reliable. If the filter was taking anything out it'd gradually change colour. It's inconceivable that the debris is the same colour as the filter. I just haven't seen a a filter look anything less than pristine on removal. I'm not saying they can't get clogged but I am suggesting that it's far more likely to go very quickly from pristine to clogged than very slowly.M4trundler said:The fuel filter takes out the microscopic stuff you can't see. The big stuff is taken out by the strainer in the tank. Fuel filters do get blocked over time. This can lead to reduced power and increased fuel consumption.