Replaced my holley red electric fuel pump couple months ago with another one and I've had no problems with it. The other day went to start the 72 camaro and it would crank but no start. Checked for spark and I have it. I checked my battery voltage and I had 12 volts, so I decided to charge it...at full charge I had 13.4 volts. I don't know if my CCA in the battery is going bad or not, I need to get that checked, I think it should start even at 12 volts... I went to try to start the car again and it started. I may have a voltage mystery drain but that's another issue. However... My question is you can hear the fuel pump come on when ignition is placed to on but when you goto run you dont hear it anymore until after it fires. I have 6 psi when ignition is placed to on but during start you see pressure decrease to like 2 or 3 psi, is this normal for the pump to not run after initial start but comes back on during run? Is it normal for pressure to be low during run? The pressure goes back up too 6 psi after. Thanks! Hopefully this makes sense.