Have 2002 Ford Explorer. Wouldn't crank, changed plugs and did tune-up, replaced fuel filter. Ran fine few days then wouldn't start again. Replaced battery, store said I had bad cell. Cranked

first need to make sure you have enough fuel pressure. Hook up a tester and check against the specs. if its too low, then your probably looking at a fuel pump. By replacing the filter, you allowed more fuel to flow. Also, make sure you are getting spark and injector pulse.

still won't crank ? how's your battery ? starter ? starter solonoid ? if your engine does'nt crank , its dead ! would'nt you check the battery first ? then move on with checking the starter circuit ? seems like your putting the cart before the horse ! first of all, when you run out of gas, you need to replace the FUEL FILTER, your engine just sucked the dirt, garbage, etc., out of the tank. there's plenty of sediment in the tank, don't know how it gets there, but, you'd be surprized ! talking threw experience !!! I operate heavy equipment, its a cardinal sin to run out of fuel !!! you say you replaced the inline filter, which one, up by the engine or the main filter, under vehicle along frame ? are we talking about the same animal, PLEASE CLARIFY !

How soon after the plugs blew out did the trouble begin ?

Did you check for a plugged fuel filter inline somewhere. It could be that the fuel pump relay is bad or even the timing may be off.

fuel pump or fuel filter

you must have an extreme amount of rust and sediment in your gas tank. you probably need to drain it completely and flush it out. I wouldn't use water to flush it as it will just cause more rust.

May be it wouldn't be a bad idea to bight the bullet and have a shop or dealer run a diagnosis to see what the actual problem is. All of the parts you replaced could have been check to see if there where good or bad. I'm sure you have spent more than a $100 in parts already. The average diagnostic charge is around a $100.

What I would need to know from you is some specifics.

What engine do you have?
Do you have fuel pressure at the rail?
do you have spark?
do you have power to the fuel pump?
do you have power to the coil?

Since you replaced all of the above parts I have to assume that you checked for all of this?

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sparks, fuel pump, ecm, fuses relays.

have diagnostic codes checked to see if you have a cam or crank sensor fault. make sure fuel pressure is at the required pressure, just testing to see if you have fuel at the valve is not enough. replace all spark plug wires. if you replaced two then all are just as old and even when they "look good" does not qualify as "they are good". Replace coil pack. start up drive away happy

probably the crank sensor, above the starter on the firewall side-no crank signal, no fuel pump activation.