2000 Chevy Blazer stalling

We need to do testing.

What is the exact fuel pressure?

IT's low. Should be 60-66 psi

I know it's only a pound. And yeah, it may be a fluctuation in the gauge, but.

IT's critical.

What brand of pump?

Information can be hard to get...accurate information anyways. This can be a daily nightmare on some vehicles. Anyways this is what Mitchell one shows. I don't recall anything other than a 4.3 in that one.

I have had enough problems with the retech-rebuilt fuel pumps that I don't off them to my customers. I would only use ac delco or delphi on this truck.

The 4.3 motors also had fuel injector troubles as well as a leaking line under the intake. Also the igntion caps are problematic. Again, I would only use the above brands for the cap.

Another test to perform is a amp draw test on fuel pump to see if it is pulling enough current. Connect one end of ampmeter to prime connector under hood and put it on 10 amp dc scale then connect the other lead to the battery positive terminal, you should be reading at least 9 amps draw, any less can give you fuel pressure but not enough volume. Also check the connector at the fuel pump for signs of overheating, I have seen a ton of these with heated up fuel pump terminals and all they need is the connector replaced, this is so common gm stocks the connectors but the new connectors use thicker gauge wire to eliminate the over heating problem. Let us know