Can anyone tell me what the unit mounted under the spare tire compartment (outside,ouderneath) on a 96 sedan is? Its part of the fuel system but I have never seen this before. I just got this vehicle and its not running. Seems to be a fuel pump issue and before dropping the tank I'd like to do the simple checks first, filter, pressure checks, ect.. Lines from fuel pump go here first and then to filter and forward. Any help is appreciated.