A week ago I went to gas station and filled up auto ran great. Got back in and would not start. We pulled car home and found car to have no spark or no fuel pump operation.Having a 2nd blazer I changed out the ECM. Same problem. I then removed the tank cover tapped on the bottom of tank with rubber mallet and engine tried to start.Thought I found problem. Replaced fuel pump with no avail.I then switched the crank shaft position sensor.Same problem.Any ideas???
How about a fuel pressure and volume check and maybe a compression check? Are you getting spark?
You need to stick with the same thread: