Last year, on hot days my car refused to start. This is of course after I went to work on a nice cool morning. My car has sat all winter with a full tank of fuel and when it would start I would let it run for 10 minutes while I worked outside. I did not put fuel stabilizer in the fuel as I have never done that with me running the vehicle in the winter - when I could get to it through the snow. I have changed my fuel pump, but I still can't hear it "whir" like everyone tells me it will. I need to know what direction to go next. What else should I be checking?