it will crank and crank and not start but it ends up always starting?

I have the same problem with 1996 Grand Marquis. Starts fine hot or cold, but if I go for a 15 minute drive and let it sit for 20 to 60 minutes, often it will not start until it cools down. It helps to open the hood and let it sit. Have changed the fuel pump and crank sensor. Lately, I have been pulling the yellow 20 amp fuse for the fuel pump from the box next to the battery. It seems to help, but it is too early to tell. None of my mechanic friends have seen it before. Annoying mystery. I leave the car running if I can't risk a delay when running errands. Still a good car. Has 193,000 miles and still strong. Never mind, that wasn't it. On to plan K.