Welcome to 2CarPros.
Lets start with the basics. Do you have proper fuel pressure and are the spark plugs getting spark? Here are a few links that you may find helpful. I will say, the easiest way to determine if it is a fuel or ignition issue is to see if it starts for a second or two using starting fluid. If it does, then it's fuel related. If it doesn't, then it's most likely ignition.
https://www.2carpros.com/articles/car-cranks-but-wont-start
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
https://www.2carpros.com/articles/how-to-test-an-ignition-system
Also, make sure the crankshaft position sensor is connected. I attached a picture of the location of the sensor and where it connects behind the AC compressor.
Also, here are the specs for fuel pressure:
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1995 Chevy Truck S10/T10 Blazer 4WD V6-262 4.3L VIN W CPI
Fuel Pressure Specifications
FUEL PRESSURE SPECIFICATIONS
WITH PCM
1. Ignition "OFF" for 10 Seconds.
2. With ignition "ON," engine "OFF" and fuel pump running, pressure should be 400-440 kPa (58-64 psi).
For additional fuel pressure testing procedures, See: A L L Diagnostic Trouble Codes ( DTC ) > Related Tests, Information and Procedures > With PCM
WITH VCM-A
1. Ignition "OFF" for 10 Seconds.
2. With ignition "ON," engine "OFF" and fuel pump running, pressure should be 380-420 kPa (55-61 psi).
For additional fuel pressure testing procedures, See: A L L Diagnostic Trouble Codes ( DTC ) > Related Tests, Information and Procedures > With VCM-A
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Let me know what you find. Keep in mind, since you have done a lot of work, it is possible the crank sensor wasn't reconnected. Also, let me know if it, too, was replaced.
Take care,
Joe
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Friday, January 29th, 2021 AT 1:42 PM
