I replaced the intake manifold gaskets on my 2000 Chevy Astro after it developed a bad coolant leak. Put it all back together and it ran better than it had in ages.
Over the next couple of starts it had more and more trouble turning over. Now it cranks but don’t get any fuel into the engine. I plugged in a fuel pressure gauge and get no pressure on the return line when I turn the key. I heard the pump come on but wasn’t getting any change. I then turned it a couple more times and the needle slowly moved up. Once I got up to 40 PSI the engine started. It then ran just great until I shut it off again. I can repeat this process of turning the key on and off for about 5 minutes and after the pressure slowly builds it will start and run. Once running it doesn’t show any of the classic symptoms of a failing pump like loss of power or surging.
I suspected it was clogged lines. I replaced the fuel filter, the old one was fine but left the new one on since why not.
Not sure what else to try so hoping someone here can give me some ideas.