I changed fuel injectors and the obd would not read so i know iv been meaning to reset anyway so disconnected battery connected wires together and left it yesterday and got up the second i got close to the truck i hear what almost sounds like the fuel pump activate battery has been disconnected a full day and every once in awhile something turns on its not the fuel pump sounds more towards the front but what can it be iv looked for other power supplies and nothing any ideas???

 

What year, motor and model are we looking at?