I have a 1997 Chevy Astro Van 2WD 4.3L with 111K miles. It was starting hard (2-3 long cranks to get it to start). I suspected the fuel pump (that was the problem the last two times it acted like this). I checked the pressure and, when you turned the key, it would slowly make it to the 55-60 psi range. However, it wouldn't not stay there. It would drop down to 0 once the pump stopped running. I figured that was a problem with the pump so I replaced it (it was still under warranty so that was the cheapest solution). With the new pump, when you turn the key it shots right up to 60 psi put still won't hold that pressure. It starts a little easier (usually by the second crank) and the pressure is pretty steady when the van is running. I thought that, after the pump shut off, the pressure should stay up for a period of time. Is that correct? If so, what, besides the pump could be causing this problem? The fuel injector pressure regulator possibly? Anything else? Is there a way to check for sure if the regulator is causing the problem?
Thanks for you help
ngpost1