UPDATE
If you have a fuel return kit installed on your car, please note that the installation may have very well bypassed the stock fuel filter. In addition, the way the fuel return kit was installed may have also introduced additional issues with the fuel feed system.
Here is a link to a video that discusses the problem. It is important to note that this problem is centralized to the way the fuel return kit itself was installed.
Once viewed, please move to page two of this thread to see continued discussions on the problem.
/UPDATE
the installation steps for the fuel return kit may have also introduced issues with respect to of the fuel kit may have introduced fuel issues
For those with a return type fuel system, did you also upgrade the fuel filter? If so, which one did you go with? The stock fuel filter connects to the fuel pump and is tiny. I am thinking about removing it and getting the AEM fuel filter.