Past that, Haines suggests using a fuel-pump voltage booster or a custom dual pump setup. The stock Flex Fuel truck injectors would be good to 460hp to 500hp naturally aspirated, Haines advises.

A:The Flex Fuel sensor is located near the fuel tank in series with the fuel pressure line routed to the engine (fuel injectors). The sensor detects the amount of alcohol (ethanol) in the gasoline ...