I have a 96 chev blazer it had a leaky fuel line i replaced it it fixed the problem , after a few months it wouldnt start so i sprayed starting fluid and it got me 60 miles now wont start i replaced fuel pump, fuel pressure regulator checked relays still has spark n suffecient fuel pressure up to the injectors but injectors are not spraying fuel what else could i do?

If you spray carb cleaner in throttle body,does it start?

Check fuel pressure

How about the fuel pump...are you getting the fuel to the cylinders? Is the fuel making it through the fuel line through the fuel filter? Drop a few drops in 1 cylinder, if it fires, you have a fuel problem. Does it turn over? If not check out the motor starter!

In the past I have seen fuel pumps that would run on the bench but wouldn't work in the gas tank. Sometimes you can bang on the gas tank and get the pump to start working, the problem is usually bad brushes. In the past I have cut open an electric fuel pump, those little brushes were wore down to the nub.
If you have good voltage and ground at the fuel pump and no pump action, suspect the fuel pump. Fuel filter is good, I didn't look to see if inline fuel filter? Fuel lines aren't clogged? Don't disconnect any fuel lines unless your sure, no fuel pressure.

I have 2000 Chevy blazer 4.3 l v6 vortex I had the same problem I would spray starter fluid into the air flirted canester Nd it would start as soon as I stopped spraying the fluid the engine would die first I checked to make sure my gas pump was working in the gas tank second I checked my fuses under the hood and last the fuel pressure so my gas pump was on in the tank fuses were also ok but I had no pressure on the gas line so that ment my gas pump was bad I replaced it after replacing it my blazer fires problems free now

leaky injector/s is flooding motor, mechanically clean or replace. And clean throttle body while you are at it with spray cleaner. Should be almost spotless where large throttle valve opens and closes.

The fuel filter could be plugged.

If your blazer is hard to start you can spray starting fluid in the throttle body and it is under the air horn. You remove the long screw which reveals the throttle body valve but do not press it open like a caruberator float just spray it in their. It helps if you turn the key on three times and then it should start. What does this all mean; Fuel Pump! I'm sorry but blazers are infamous for the fuel pump going out. Go to www.under100dollars.com and you can find a fuel pump for your blazer for like 70 dollars. If you get it from a auto parts store it's going to be like 200 or 300 dollars. It's not to hard to due but the fuel tank strap bolts can be difficult.

have 1994 4.3 cpi and the problem I had sounds same.
It was a leaky pressure line in pletium . easy fix $45.00 part $15.00 gasket.
the leak was caused from the fuel lines rubbing together in pletium.
take the vortec cover off ,then remove air regulator in middle and look inside . I turned on power to key and gas spray came from drivers side of pletium looking in hole.fuel line side. if gas spray on passanger side then gas regulator faulty. takes 5 min to check
After fixing truck runs runs great. no more gas smell in cab.
also you can smell oil for gas

have you checked the fuel pump relay? usually that is the problem seeing is that it fires when you use the starting fluid.