The fuel pumps are Bosch. One pump is *supposed* to be good for 800HP (on paper!) but two is better! Both pumps are wired together, but an option is to use one pump as the primary and turn the other one on with a hobbs (pressure) switch when the boost comes up. There is a one-way valve on the outlet of the top pump that would prevent the fuel from back-flowing though it when it's off. I may get around to that one day! I also need to clean it up!