[Texasdoc]

Right. I have a 100 micron filter before the pump and a 10 micron filter after the pump. The question was: are the small $10 glass 100 micron filters you can get at O'Reilly good enough for a pre-filter, or is the $75 filter needed.

The consensus is that those small $10 filters, although they have the right micron filter rating, they don't flow enough fuel for an EFI system. They may be ok for carb systems, but are a no-go on EFI.