From the SDS section 28-10-00-005:
FUEL STORAGE - CENTER TANK SCAVENGE SYSTEM
General
The center tank fuel scavenge system increases the quantity of fuel you can use.
Functional Description
The left forward boost pump supplies motive flow to a jet pump. The jet pump removes fuel from the center tank and transfers it to main tank
1. The jet pump has no parts that move. It is on the left front spar. A fuel scavenge shutoff valve controls fuel sent to main tank 1. When the fuel level in main tank 1 decreases to 4,487 lbs (1,990 kgs) the float valve opens.
The minimum fuel transfer rate for the fuel scavenge system is 220 lbs/hour (100 kgs/hour). The fuel transfer rate for the fuel scavenge system is generally between 220 lbs/hour (100 kgs/hour) and 450 lbs/hour (200 kgs/hour).
I'd say you have a pretty good understanding of the system..