Took Challenger out and made a couple of local stops.( 71 340 / stock 4bbl carb set up) .

After first stop ( after driving car for 20 minutes ) , just for a few minutes , car started back up, no issues.

After second stop driving another 5 minutes, but leaving it for about 15 minutes, car would crank over but not start.
As it was warmed up, I initially gave it no gas upon start.
But then tried a couple of pumps and still no start.
I had this happen when car was stopped when it was inspected last year, and we ended up spraying starter fluid in carb and it started.
Remembering this, and thinking Vapor Lock at first, I checked to see if gas was coming out of primaries when moving the throttle manually, and there was.
So I tried again, and it would not start.
I then sprayed starting fluid in the carb, and it started up.

I don't think with gas coming out of primaries that it is vapor lock, is it?
I also took gas cap off , and I did not hear any pressure noise upon opening.

Any feedback appreciated .