Yesterday I went to leave a restaurtant after lunch and the truck just wouldn't start. It would roll over just wouldn't start. We are assuming it is one of two things... 1-Fuel filter. I had let my tank get really REALLY low several times this last month so I am assuming I may have a clog. We can't find the filter location however. 2-Alternator. My volts were showing incredibly low...we did try to jump start (and pop the clutch) but neither worked. HELP PLEASE! Thank you!