Possible fuel pump issue? Or...? Options

[4x4loyr]

A funny thing happened on the way home the other day ...

1974 2.0 FI

Looking for a little help in diagnosing a problem that has appeared with my car. On a recent Wednesday, I took the car on a 300 mile round trip drive, including Los Angeles traffic (the car "rested" for about 1.25 hours in between drives). The car drove great for the majority of the time, always started. Only issue on this trip was a low idle after several hours of driving (when I was almost home). (This was the single longest & most driving time I had done with the car in the 14 months that I've owned it.)

The next time I drove (started) the car was the following Saturday; my son and I drove 18 miles to the local Cars & Coffee in Carlsbad, Ca. Again, no problems. We were at the Cars & Coffee for about 1.5 hours when I needed to leave to get my son to water polo practice.

The car started fine, and we made it out of the crowded parking lot; we turned onto the main thoroughfare, and about 2 blocks away, at the major intersection, the car stalled. It would not re-start. Pushed the car into the parking lot and attempted to bump-start it -- no luck. There was a gas station at this intersection, so I added gas, as fuel seemed to be the item that was missing. Finally had to have the car towed home on a flatbed.

Throughout the day (Saturday still) the car would not start. Additionally, I could not (did not) hear the Fuel Pump "click" upon turning the key (I was listening under the car while a kid turned the key.) No further attempts were made to start the car until Monday.

On Monday, I started my research of what the issues could be. In the afternoon, I swapped one of the Headlight Motor relays for the Fuel Pump relay (in the engine bay), and attempted to start the car. Low & behold ... the engine fired right up ... however, it barely idled; it constantly wanted to die. My first thoughts were, "bad relay," hooray! But, I placed the original Fuel Pump relay into the Headlight Motor location, and the Headlight popped up. I guess both relays are working ... The car started numerous times during this time.

I am guessing that the passage of time has allowed the car the ability to start again (which seems to lead me to a heat issue; but, it wasn't there 3 days before.) (IMG:style_emoticons/default/headbang.gif)

Is my Fuel Pump beginning to fail?

Any hints, suggestions, and/or trouble-shooting advise is greatly appreciated.

Thanks,
Ty....