fuel pump problems????

hey, i just put a new fuel pump in my truck because the other one went out i have driven it at least 40 miles probably and the other day i drove it to town no problem got to where i was going went in came back out and it wouldnt start. It was just like the pump wasnt pumping again so i cycled the key a couple times and it started i figured maybe when we replaced the pump we messed the fuel guage up so i went and put gas in it it started fine then too and has but what could have caused this should i be concerned???its a 1996 chevy k1500 cheyenne

1) Check fuel pressure.
2) If no pressure check the fuel pump fuse, relay, and filter.

how do i check the pressure?? and i replaced the filter when i replaced the pump. oh yeah and one thing i think i forgot to put it didnt act like it was running out of gas

Locate the schrader valve located on the fuel rail, it looks like a metal valve stem to a wheel and a pressure guage, it canbe bought or borrowed @ any Auto parts store.

ok thanks