My engine wont start up why?

Hello well the first thing is is to check to see how long its been since a tune up was done and this sounds like a pick up in the distributor is going bad once it gets hot it won't start until it cools down and will stall and act like it wants to shut off. I hope this will help you out.

2000 chevy s-10 blazer will crank but not start. Put fuel in carb and starts right up as soon as the gas runs out it shuts off. The fuel pump was replaced as well as the filter. Gauge pressure reader reads 65 when key is on but drops when key is off. Could it be the fuel pressure regulator?

I bought the vehicle and drove it home. Started at least six times the day I got it. Three days later, I try to start it and it turns over fine but does not start. I am going through basic stuff looking around engine. See nothing out of place. I get carburetor cleaner, it will start and runs good until cleaner is burned off. I press the valve for the fuel pressure and it gives a squirt. I go re prime, cannot hear the pump due to the dinging from the dash (waiting on fiancee to get here right now). Prime and I get squirts from the test valve so fuel is getting there. This is the model where I believe the injectors are in the air manifold? So I cannot easily reach them to test with an ohm meter. I do have some tools but not an auto mechanic. Any tips on what I should check or look for? Full time college student so I cannot afford to go nickle and dime myself at this point. Just need it to run, lol. Like everyone does who has a car.