Stalling issues
 

I have a 97 chevy blazer 4.3 4wheel drive i start the truck and drive my wife to work and it stalled in the middle.of the highway and would nor start ... After pushing it off the road amd it sitting for about 15 minutes and having a friend look it over i tried it again and it started drove it for like 20 minute to a gas station got gas cause i had a 1/4 of a tank amd it stalled at the pump would not restart pushed it out from the pump my friend tapped on the 3 relays under the hood on the passenger side hooked on the firewall i turned the key and it started im baffled any help is appreciated ive already replaced the pump twice.

Still worth checking for fuel pressure, if nothing else so to eliminate the pump being at fault.