How to change fuel filter?

Spizzer wrote:

prism wrote:

pigman1 wrote:
Use your thumb to block the center hole of the filter when you are pre-filling. Tighten it based on instructions marked on the filter, so read first. A stripe with a magic marker on the bottom will let you know when you have reached your tight point.

I just have to ask why would you block the center hole? for what purpose>? I dont understand that idea? anyone care to explain the thinking behind that idea?
thanks

I think it is so the fuel that ends up in the center is filtered. If you pour it in the center and it has contaminants, they go directly into the injector system.

Jeff

Jeff is correct. And like I said previously, I use the proper size bolt to screw in the center of the filter and with it plugged pour the fuel in the outside holes, but a thumb works real well.