Newbie here, thanks for any advice you can give. My 2000 Silverado (105k) doesn't want to start until the third time cranking on cold starts, or even after sitting for 15 minutes or more. The 3 times rule goes for cranking the engine, or for just turning the ignition on for a few seconds, off for a few seconds, on for a few seconds... 3 times. I replaced the fuel filter a week ago. The old filter was definitely in need of replacement and was fairly clogged up. I swapped the horn and fuel pump relays (identical) and no change in symptom. I pulled the vacuum line from the fuel pressure regulator and it was bone dry, not even a trace of fuel. (MAF sensor was replaced too, fixing some bogging above 3k rpm) So, I'm unfortunately leaning towards a fuel pump. Book says 55-62psi with key ON engine OFF. I heard that Autozone could check fuel pressure. Am I just watching to see what the pressure looks like after the 1st, 2nd, and 3rd times I cycle the key? What should I be looking for? What else should I be looking at?