I have been told that I have a bad leak detector pump on my 2002 doge dakota 4.7 v-8, this unit is supposedly located under the battery in the front, does anyone know of this unit and maybe if I don't have the right name on the part, it causes my check engin light to come on, the mechanic got if going last time and it lasted about 300 miles but is acting up again, this 4.7 engine has been alot of problems for me