Question about 1986 Chevrolet S-10 Blazer

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1986Blazer 2.8 Not Starting

Turns over fine put new fuel pump and filter new ECM.With fuel tank on ground can confirm pump is working for a few sec. I have checked with scanner but get no codes.I have blown threw the fuel line to make sure it was open.Does the ECM need to be reprogramed or is there some thing I am over looking Please help Oh yea when it cut off it made a beeping sound from behind radio but I didnt find anything there. Thank you dwb

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Did you check for spark? sound like a ignition problem

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