Don't ask why, but I found this very interesting and informative diagnostic guide from Carter. There is also some bulletins from Carter as well.
http://www.carterfueldelivery.com/fuelpumps/fuel_sys_diagnostics.php (http://www.carterfueldelivery.com/fuelpumps/fuel_sys_diagnostics.php)
Figured it could help somebody out ahem now or in the future.