Could be the fuel pump is not providing the proper fuel pressure !
Fuel psi less than 50 psi no start GM CPI Vortec
SOURCE: my 95 chevy blazer 4.3
The cam sensor,or pick up coil in the distributor is at fault,witch ever it has.
SOURCE: 1996 CHEVY S-10 WONT START UNLESS I SPRAY STARTING FLUID IN
The Fuel pump is is in the gas tank.
The Fuel relay is in your glove compartment behind a panel on the left corner and the realy i believe is the middle one.
The Fuel filter is on the inside of the frame rail under the driver's door.
Note: the fuel pressure for the 4.3 I think is 66 psi and drops 6 to 10 psi at idle.
Good luck and hope this helps
SOURCE: 2000 chevy blazer (4.3 engine) has a hard time starting in the
on your next fuel up add 93 octane fuel and a bottle of Fuelinjecto cleaner (not Octane Booster). This did the trick on my 95 blazer
SOURCE: My 1999 Chevy Tahoe wont start unless i spray
It is not a fuel pump problem.
It a cold start valve problem. It didn't open. There are 2 things to check.
1- The cooling thermal sensor is not sending the proper signal to the ECU to turn on the cold start valve.
2- The bad solenoid inside the cold start valve causing it not operational.
Case 1 you can easily replace the thermal sensor.
Case 2 checking this requires professional skill to confirm if there is a signal at the valve during the start.
Good luck
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