1994 blazer 4x4 300 vortec engin dosn't start sometimes( injectors?)

my blazer dosnt start sometimes after its been drivin for awile .When i first got it it wouldnt start without starter fluid so i replaced the fuel pump,screen&filter then it worked good for a couple weeks now
it starts fine with cold engin when it wont start i can get it to start with starter fluid or let it cool fuel pump pressere stays at 55# at start then 50# running mecanic thinks its injecters but i dont? anybody have any suggestions TIA
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