Please read through and ask questions if unsure if this is for you. Please don’t purchase if in doubt. Message me and I’ll be happy to help see if this is what your vehicle needs. This is a AC Delco GM OEM auxiliary tank fuel pump module kit without fuel level sensor. This is new old stock. Part. Has been sealed as shown in photos. Fitment for this is for various 2011-2019 6.0L Chevrolet Silverado 3500HD and GMC Sierra 3500HD according to the GM catalogue. Usage for this requires engine flexible fuel (L96). For vehicles built with RPN N2N (dual fuel tank front tank 23.5 gallons rear tank 40 gallons. For 2nd design vehicles. I used a stock photo showing what the unit looks like due to the actual one being sealed still. Please ask if unsure. Thank you.