I had an earlier post about a slight stumble off idle and a little rough idle ,i replaced the spider due to a misfire !! I checked for vacuum leaks with a unlit torch and found nothing , today i decided to check the fuel pressure and this is what i have ----54psi engine off ----52 psi with the engine running and warmed up!!! please give me your opinions gentlemen!!! I believe its low ?????????

 

this link should have your answers

https://blazerforum.com/forum/tech-a...agnosis-23038/

 

Key on, engine off, fuel pump running: pressure must be 60psi to 66psi and must remain above 55psi for at least 5 minutes, (the longer the better) after the pump shuts off. Low fuel pressure will cause misfire, stumble, hesitation, stalling, hard starting, no start, lean DTC's, possible MAF DTC's, etc etc. If it ends up needing a pump, don't go cheap, use AC Delco or Delphi only.

 

Yes. replace pump. AC DELCO OR DELPHI......that means no running to autozone or advance and picking up a pump for cheap...its not gonna last.

 

Thank you very much !!thats the answers i was looking for

 

I saw a ac/delco fuel pump module on ebay and i was wondering are they all the same as far as 4dr units, i know the 2 dr units are different ? just wondering what all those codes stand for ,,,kinda confusing !!! I have a 97 blazer 4dr 4wd lt !!!

 

2 door and 4 door pumps are NOT interchangable.

 

Thank you!!!

 

Take a look at rockauto.com i remember seeing a ac delco for 50 bucks,but it might not be the right one you need for your blazer.

 

thats with out the sending unit right ?