QUIET external low-pressure electric fuel pump?

You are confusing our mechanical pumps with the PowerSurge units.

The 550HP and 1100HP pumps are mechanical pumps.

The PowerSurge 500 and PowerSurge 1000 are surge tanks with electric fuel pumps inside.

The instructions for the PowerSurge units can be found at the bottom of this page: http://www.robbmcperformance.com/products/powersurge.html