Gaspar,
The ecu must be set at a specific hi and low (idle) rpm flashed into its memory. Why doesnt the ecu just adapt and deliver the correct voltage to the pump to compensate for the + or - rpms as needed. No other turbine that i can see suffers from this hi idle problem, they all use over flow tanks and miles of fuel tubing with multiple tanks?? I do not own a wren but i have a friend with a ss who has had the same issues.
V..