Hello! This is my first time posting but I recently bought a 2000 S10 blazer 4.3l v6 and have been fixing the minor problems that came up. I have only owned the truck for about a month and a half but have had the issues since I got it. My situation is that I got a new fuel pump, crank sensor, and oil lines yesterday and when I started it this morning it was great. Then once I started my daily routine of going out and about the problems persisted. If I leave the truck off for 5 minutes or more like a Walmart run in and out it has a hard start that takes about 5-6 seconds. After looking at it myself and other mechanics I can not figure out what to fix as I want the starting problem fixed and it can’t be the fuel pressure regulator as there is no puddle of fuel or over flow and the crank sensor and fuel pump were replaced. Any help into what this could be would help tremendously thank you and sorry for the long post.

 

check pressures using the guidelines in the sticky, no more then 5 PSI of leakdown in 10 minutes, pressures should be 60PSI at the shrader valve under the hood and deadhead pressures over 75PSI at the filter.