The low-pressure fuel system is the backbone of the entire fuel system. If your engine isn't getting the right pressure or flow, this can cause serious damage. Inadequate water separation, or filtration in general, can also cause premature failures of all high-pressure components. These aftermarket systems are also essential for those of you looking to increase the power output of your engine. Most stock pumps are not able to provide the fuel and flow needed for higher flow high-pressure pumps and larger injectors. Both Airdog and Fass Fuel systems are excellent choices to replace your stock system. They both have many options for your desired horsepower rating. These kits are fairly straightforward and take about 3-5 hours to install, depending on the kit/truck. In most cases, your stock filter/filters can be bypassed or completely removed. In short, these kits are key for support for all aftermarket fuel system changes, as well as increasing the longevity of your fuel system components.