AH! Now I understand. I'll check it out.
As I mentioned earlier, I did do a serious cleaning of the engine and underbody before I tore into it. And yes, I did wash the engine with a de-greaser but I was careful to protect the electronics. That said, it's difficult to avoid getting some water in which might have led to corrosion on some of the relay pins.
Thanks.
P.S. Since the above entry, I replaced the IDM relay and cleaned several connectors with some electronic spray cleaner. Still no luck. However, just for fun I emptied the fuel filter bowl, removed the filter and turned the ignition to the "on" position. The bowl began to fill but not nearly as fast as I expected. Is that normal? Now I'm beginning to wonder if I have sufficient fuel pressure. I want to add a fuel pressure gauge and would appreciate a recommendation. I prefer a mechanical, oil-filled gauge mounted in the engine compartment. I've looked at several on-line brands but am at a loss as to which way to go. Also, I need some advice on where to connect it ans what fittings etc I will need. As always, I appreciate your input.