Intermittent crank no start issue

Hi Ken,
There is no stored OBDII code in the system, I did scan it. And for checking the fuel pressure, I was researching it looks like my Hyundai model needs these two special adapters to connect the fuel line with fuel pressure guage, and they are expensive adapters. Please let me know, if you suggest any other way around to measure the fuel pressure.
09353-24000 - Fuel Pressure Gauge Connector
09353-38000 - Fuel Pressure Gauge Adapter

I encountered the same problem again this afternoon twice, and I did notice a pattern. I started the car, it started fine, then it shut off immediately. Then I cranked the engine and it went non-stop without starting. Then I primed the pump for two to three cycles by going from key off to accessory on position, and tried again and the car started. And car always runs smooth and no idling situation either after its started. So I am thinking, is it the clogged fuel filter (which is part of fuel pump assembly) or the fuel pump itself is bad, and multiple priming shocks it to run it again? Any opinion? And do you know if I can buy the fuel filter separate on this car, or it comes as whole assembly?

Attaching the snapshot of bluedriver live scan, shows certain parameters I monitored when it was not starting on cranking.

Also, attaching the attachment guide for fuel pressure testing with adapters I mentioned above.

Sorry I forgot to post updates here, for now I m just making my way out by priming the pump if it gets stuck on me, and also making sure that the gas tank never goes below half, so I am forcing pump to work extra hard. I will wait till this completely pump dies for replacing it, as it is an expensive assembly if buy new.