Fuel pump won't cycle when the key is turned on 93 Chevy astronaut 4.3 eng

injectors get signal from ECU
so no pulse at the injectors ?
is the crank angle sensor and all other sensors ok

any chance you have a diagnostic tool
any other fault codes

1989 Chevy blazer 4.3 won't start..I have ... - CarGurus

www.cargurus.com > Questions > Chevrolet > BlazerCarGurusJan 30, 2013 - 96 Chevy S10 Blazer with 4.3 L engine vortex will turn over but won'tstart. ... i a 93 k5 blazer 5.7tbi in cold weather it will not start, if i hook jumper ... was told it just needed a Fuel pump, I replaced the Fuel pump, and the Filter, ...

Are you saying it will not crank, or not start ?

fuel filter ?

Check to see if the fuel pump runs for a few seconds when you first turn the key to the "run" position. You should be able to hear it if you put your ear to the gas cap while someone turns the key. It will run for 3 or 4 seconds and then stop.
Check for spark. Easiest way it to hook a timing light to any wire and turn the engine over. There are many reasons for no spark. Most common being the coil, sensors, MAF etc.
If the fuel pump isn't running. Check fuses, wires, and finally... change the fuel pump if all else fails. You would be well advised to find one at an auto wrecker if you can. They are expensive.

can you hear the pump when you turn the key on?

Now you have a good battery & a starter that turns over the motor

Have you cycled the key on & off with a fuel pressure gauge on the
fuel rail?

Do you have a fuel filter that isn't over 3 or 4 years old?

Have you checked for spark while cranking ? Use an old plug on the wires,
if you have ignition wires,don't ground the wire without resistance

If you removed the ducting & MAF Sensor it won't start

Tell us what you checked & exactly how that was done.

A common problem is if the fuel pressure regulator leaks internally. This causes fuel pressure to bleed down over time and makes it hard to start the vehicle if it has been sitting for usually more than a few hours. Sounds like that could be what you are dealing with.

Check the fuse under the dash. Did you replace the inline fuel filter? If not, you could loosen the line going into the filter then turn the key to the on position. The pump should run for about 2 seconds then the relay should kick off. Turn off the key for approx. 5 seconds then cycle key back on and the pump should cycle again. If you get a 2 second burst of fuel each time then the pump is cycling. Install a new fuel filter and check the grounded wire by the tank. Hope this helps. :)

Check this itemsof information:
93ZJ Secc 8D Ignition Systems
or
93ZJ Secc 14 Fuel System

Good luck!!!