2001 chevy S10 blazer starting issue

Hello, I’m Pete from the Car Genius team at RepairPal. I’m sorry you’re dealing with this concern on your 2001 Chevy S10 Blazer. Based on the information provided it sounds like you are experiencing a concern with no fuel pressure at the test port and you have already replaced multiple components to try and resolve this concern. With what has already been checked and replaced the loss of fuel pressure can be caused by a faulty fuel pump relay, a wiring concern leading from the relay to the pump itself, an internal engine computer (PCM) failure, or even a fault with a component like the electronic ignition switch or a blown fuel pump fuse (as some of these models had). These will all need to be checked/tested to pinpoint which component is at fault. Once the faulty component is located it can then be repaired or replaced to resolve this concern. If you’d like to find a trusted, certified repair shop in your area, you can check here: https://repairpal.com/certified. If you need more advice, or have any further questions about your vehicle, we’re here to help. Just give us a call at 877-913-1554 where we will be happy to assist!