Lemmesee... first I would look for loose wires, vacuum hoses, bad battery
cables and such.  Next I would check the fuel shut-off switch and push the
button to reset it (it's usually under the top edge of the carpet on the
passenger side in front).  Next I would check for voltage to the ignition
coil and pressure test the fuel pump.  If you can get it to an auto parts
store have them load-test the battery.

Doesn't crank or doesn't start ??????????

  The information seems conflicting.  If the engine is not cranking then
it doesn't matter, at this point, if there is a fuel problem.  So let me
make an assumption.  All of the electrical appears to work, ie. lights,
radio, etc, but when you turn to ignition, nothing.  You cannot hear the
starter turning the engine over.  Hopefully you do not have the same
problem I just had with my 95 Explorer which had just went past 250,000
miles.  My son was driving the Explorer and the engine just died (and I
was never clear on how exactly my son was driving it).  Turns out the
engine had seized up, so when attempting to start the starter motor
could do nothing.  The easiest way to check this is to turn the engine
over by hand using a 19mm socket and breaker bar on the crank case pulley.
It should turn easily.  In my case I couldn't budge it.  The engine needed
some major work and I ended up just donating the non-working vehicle.
Since this was my son's car so we decided to replace it with another Explorer,
but with much less miles.  We found a very nice 98 Explorer with 85000 miles
for $5000.  I figured if I could get 250,000 miles from one OHV 4.0 I could
do it again.  Between us we have already put another 6000 miles on the 98.
Mark