Hi. Need a little help. My 85 380se Mercedes quit running a few months ago and now it will not start. Before that, I could here a humming sound coming like from the fuel pump, at least I thought so. I don't here the fuel pump turning on. Is there a fuel pump inside the gas tank. I see one outside in the rear by the passenger side? AutoZone tells me there is one inside the tank. I don't want to put the tank down for nothing. If you think it could be something else please let me know. Thank you