I apologize for the long read, but I did condense it, I hope this may help.
When it's not starting and key is "on", is the ck eng light on? Then does the light go off when cranking? If the ck eng light comes on, that at least tells you the PCM relay is supplying power to the PCM, if it goes out while cranking, that should tell you the PCM is seeing an RPM signal from the crankshaft pos sensor.
If you want to check PCM & FP relays, go the the engine fuse box. Mark the relays so you can keep track before swapping. The PCM relay is one of three bigger cube shaped relays and is the corner one ( pos #30 ) The FP relay is the same size as PCM, just skip over the middle spot ( pos #32 ). There are only 3 big (cube shaped) relays and they are all in a line, the middle relay is the HVAC blower motor.
FYI, there is a fuel pump kill switch too (inertia switch), it's designed to kill power to the fuel pump during a collision or big impacts. This switch has to be manually reset so, I doubt the switch is your problem but you might check the connector and pins for a good contact. The switch connector can also be a place to check for power going to the pump. Keep in the mind the FP is only powered for a few seconds after turning the key "on"
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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