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Holley supplies a high-pressure inline fuel pump with the Commander 950. Since we already had a Holley Volumax fuel pump and filter installed near the tank for the carbureted setup, we plumbed the new pump close to the engine and ran a dual-pump system. Since the Camaro was a carbureted car from the factory, we had to run a 3/8-inch fuel return line (the silver tube in front of Cary's hand) for the EFI. Note the oxygen sensor plumbed into the 3-1/2-inch collector on the Hooker 1-7/8-inch primary header.