Ahhh, the mysterious no starting Voyager/caravan syndrome. I would bet my ex wifes bank account I know what the issue is. Had a many of these spend some time at the shop until we could get them to act up. After we started seeing a repeat of these vans coming in on the hook, we started instructing out clients with the same symptoms as yours to purchase a cheap rubber mallet.
No, not to smack yourself in the head; however, I bet at times when this breaks down, you would like too. No, beat the van instead. Next time you get the "crank, no start" get out, bend over and smack the fuel tank a couple of times on the bottom about center of the tank. Re attempt the start. If it starts, like I think it will, hang a pump in it.
If this does not diagnose it, the only other way to diagnose this is to have it spend some time with the shop. I have driven vehicles home with fuel gages taped to the windshield and scan tools recording, just to break down and go "Ooooh, so thats what the problem is." Some times, a techs gotta break down too to fix the issue.
So, buy a mallet.
Let me know.
So when you say "hang a pump in it" you mean replace fuel pump? I am willing to try almost anything, but I am curious to know why banging on the gas tank makes a difference?
The fuel pump is a electric motor. At times, the brushes in the moter wear, and get hot. A good thumping gets the motor moving again.
Like I said, I am about 95% on this just because it fits in the usual M.O. for a Chrysler/plym/dodge van intermitant no start condition.