Kenne Bell, The Innovators, have done it again: An ingenious, reliable yet simple solution to your fuel system needs. Just tap into your existing fuel pump wiring. Imagine 50% more fuel delivery and horsepower without the hassle and expense of draining and removing the gas tank, tapping into fuel lines or adding a noisy in-line pump - and it doesn't heat the fuel up. The Kenne Bell BOOST-A-PUMP™ is fully adjustable from 1% to 50% with the mere turn of a dial, so pump output can be varied to match your engine's needs. No longer are you "locked in" to a fixed pump capacity and/or pressure. It activates ONLY at full throttle (naturally aspirated) or at 5 psi (turbo or supercharged). And it acts as a voltage regulator by compensating for any and all system voltage fluctuations. Until now, fuel delivery could only be adjusted through the use of a pressure regulator, or an in-line fuel return shut off valve (FMU). Unfortunately, the regulator also locks you into a richer and higher pressure at idle and part throttle which can affect driveability and emissions. The FMU limits you to a fixed wide open throttle pressure. Features • Doesn't heat up fuel like larger inline or intank pumps. • No octane loss (gas will begin to boil at 95 degrees). • Used with all Kenne Bell Supercharger Kits. • Increases existing fuel pump capacity up to 50%. • Easily installed. Uses stock wiring. No fuel line modifications. • Adjustable from 1% to 50% - ON DEMAND from driver's seat. • Variable Output Cockpit Controller mounts under dash. • No batteries to run down, replace or let you down. • Eliminates expensive and time consuming fuel tank removal. • Works with any pump full or part-time. • Activation vacuum or pressure switch included in kit. • Compensates for reduced voltage (lower pump output) when lights or other accessories are on. • Maintains consistent pump output regardless of battery voltage (down to 10 volts). • Optimizes Air/Fuel Ratio and horsepower by matching the engine fuel requirements. • Quiet operation. Not NOISY like in line pumps. • Improves gas mileage if vehicle now running on high idle fuel pressure. • Maintains stock fuel pressure at idle and part throttle. • Controls WOT fuel pressure with return line shut off valves (FMU,FSB). • Maintains constant output voltage to pump within 1% from 10 to 12.5 battery voltage. • Doesn't affect pump life. • Ideal for any Nitrous System. • Anodized red aluminum. • Fused circuit protection. • Works on any car, truck, or boat with 12V electric fuel pump. • Compact size, lightweight (less than 2 lbs.). • Guaranteed.