What makes you think you get better filtration that way?

 

I would agree that after maybe 1000 miles a filter may do its job better than brand new. But once it gets to a certain point, little particles are gonna end up working their way past. If that wasn't the case more people/manufacturers would say to just change it when it clogs.

 

Is that your best guesstimate?
How little?
The concept of fuel pressure is such a wonderful thing. High pressure, low pressure, no pressure, rail pressure. Maybe it's too complicated and that's why so few people take the time to understand it. Then again, tending towards that extreme, some people's idea of maintenance is just run it until it quits and buy another.

 

I'm not a fuel filter specialist. I'm just speaking from what would seem to be common sense. As far as pressures...correct me if I'm wrong on this part but with a dirty filter wouldn't fp increase a hair and rp drop? On another note maybe I should start selling my 10k mile fuel filters to people that want better filtration....

 

You know what they say about common sense? It's not all that common. But to address some more of your questions:
Define dirty. Trapping contaminants (otherwise known as "dirt") is a filter's job.
No. RP will be held as commanded by the ECM as long as positive pressure even as low as 1psi exists at the CP3 inlet.
That would demonstrate your excellent common sense!