Starting the car problems

[alerocar01]

I have had this problem for a long time. I will go to start the car and it will turn over for 15 seconds and then start, then die. turn the key again and starts up. the car runs fine 30 seconds after starting it. i have trying changing the fuel filter and seaform in the gas tank with no results. i know most car it takes two seconds to start up not 15 sometime like mine. i have also turn the key to on to let the fuel pump get going and nothing. i'm tired of feeling dumb sitting in my car turning the key and it takes forever to start. any one have any ideas on how to fix this problem?