First, I'm not sure if this has been covered before, but I've completed numerous searches and haven't found it yet, so sorry if it is already out there. The problem is this: For the past 4 years during the hottest summer months my 90 Civic has difficulty starting. I have to crank it numerous times and eventually it will catch. I generally pump the gas pedal 3 times and it turns over (on the advice of a chemical engineer I met in a parking lot), but with the record heat it is taking a long time. The mechanics (at the shop I have gone to for 6 years) have suggested it could be the fuel pump but need me to leave it with them and have it "act up" before they can tell what the problem is. A friend of a friend suggested it might be the carburetor (heat shield not in place or something like that). The car has 107,000 miles and has always run well. Any help would be appreciated. Thank you.