Two pumps for redundancy, and with my EFI I can stage them. I run one pump all the time of course then at greater than 60% throttle and over 3000RPM the computer will kick the second pump on. It will run on one pump but its pretty close to its limits at 550ish HP so the second pump is there for insurance. Plus in the event of a pump failure on the road I can move one wire in the back to turn the secondary pump into the primary pump.

Just something I did to keep a 10 second street car reliable when travelling the back roads of the Midwest on drag week.