I know several Sniper installers are going the RobbMc Powersurge route in order to NOT mess with the fuel tank. The conventional installation calls for blocking off the mechanical pump's return-to-tank line and having the unneeded fuel returned to the tank through the Powersurge return port. I see a potential problem with this setup. The Powersurge has a very restricted orifice in the inlet port (from mechanical pump) (pic). With it's return line blocked, the mechanical pump is trying to pump everything it has through that tiny hole......that can't be a good thing. The pump is rated (iirc) at 3.5-4.5 psi. What does that pressure rise to if the tank return line is closed? Wngrog had a mechanical pump failure that also took out his powersurge pump. Could this have contributed to that failure...dunno. I was considering reconnecting the mechanical pump to the tank return line but that could possibly force a back-flow to the Powersurge. Open to comments.