So your stock lift pump is starting to die? Well, unfortunately if you're a Cummins owner, that's not a big surprise. While a complete replacement pump with integrated filters, such as a BD Flow-Max is the BEST route to take, for trucks that aren't pushing the limits of fueling, a good old pusher style pump will usually do the trick. This pump is designed to work in unison with your stock lift pump by running in-line on the frame rail to deliver that extra boost of fueling your injection pump needs.