Quote Originally Posted by farmtruc View Post
Here you go, this is with both pumps installed and the same result with just the intank pump installed and the inline bypassed.

http://www.ls1truck.com/newstorage/j...ldrop-lowq.wmv
I bet there is a restriction in the fuel system somewhere. Run -8 line to the fuel rails and remove that chance. In the video the fuel mixture stays good even though the pressure falls off. Can you load the dyno and roll up to speed rather than matting it?