I do not know if this will help but I just bought a delphi a week ago and put it in and it came on but truck would not fire. Eventually figured out that I had the wrong fuel pump. There are 2 of them. One is for the throttle body and the other is for the vortek with the spider injectors.I will get the #s for you.

 

Here is the delphi fuel pump # for 1993 blazer 4x4 vin# w Vortec v6 FEO114. Here is the one for a throttle body. # FEO115. They look identical. The delphi is for sure worth the money. Airtek lasted around a month for me. I will never buy another one. Hope this helps.

 

Reddhead, thanks for the info but he mentioned that he bought the delphi pump with the sending unit and everything included. I think your part numbers are just for the pump. 93&94, make sure the part number for the pump you bought is HP10004 for the Vortec engine or HP10005 for the Z code engine. I do second the suggestion of checking the spider before you do anything else.