Ford Repair: Explorer wont start sometimes..., proper diagnosis, ford dealers

Question
QUESTION: We have a 2002 Ford Explorer.  For some reason that we cannot understand the car will be running fine, we'll turn off the engine normally for just a short time (5 minutes up to an hour) and then when we go back to start it then it won't start.  It will sound like it wants to start but just not do that final fire up.  No matter what we do it won't start.  Hold the pedal to floor and try, nope.  Don't put foot on gas, nope.  Nothing!  Wait 3+ hours until it cools and sits for a long time and it will start right up.  We have taken it to multiple mechanics including dealerships and they hook it up to diagnostics only to find nothing at all wrong.  It happened multiple times last spring and summer.  Then didn't notice anything in the cool weather.  But over the last 4 weeks or so it has happened 5 times.  Mostly during hot days or rainy/high pressure days.  Due to all that it just sounds like the old Vapor Lock issue.  I know that isn't logical but have read that it isn't impossible.  Can you help?  We were hoping to hold out three more months until other car is paid off before incurring another car payment but this is the car the kids are driven around in.

ANSWER: hey there, there are many possiblities for this problem, could be anything from a seizing fuel pump to a bad sensor, is there a check eninge light on?? get back to me.
Chris

---------- FOLLOW-UP ----------

QUESTION: Check engine light does not come on at any time.  They have hooked it up to the usual diagnostic tests and it passes every time.  Thanks for responding!

Answer
hey there, well unfortunatly this is not something i can diagnose online because there are so many posibilities,  My best suggestion to you would be to take it to a fard dealer and get a proper diagnosis on it, they will perform certain tests with computers that are only available at the Ford dealers that should be able to pinpoint the problem, good luck
Chris