If you run a diesel, this is the absolute best product to use if you want to protect your fuel injection system. If you opt for removing that non-sensical in-tank lift-pump and install an externally mounted lift pump, Installing one of these on the tank's draw-straw outlet line in conjunction with an additional 2-micron spin-on filter kit will protect your expensive high-pressure injection pump, and fuel injectors and make them last much, much longer. I added this to my diesel truck after putting in a larger fuel tank. Have since put on over 200K miles and fuel injection system working perfectly.