1999 suburban 5.7
my fuel pressure while primed is 60 and hold fine. let it sit for like 15 and didnt drop a hair. When its started the fuel pressure goes down to 52 at idle.
should i let it sit longer to see if there is a really slow leak somewhere?
I have a new fuel filter coming tomorrow in the mail and a scan tool.
I ran some seafoam through it and didnt improve any.

is my fuel pressure regulator acting up?

oh and i just put in new spark plugs they looked fine completely dry.

thanks any info helps

 

Pull the hose off the regulator, no fuel, it's ok. What is the idle rpm? How old is the fuel pump?

 

k ill try that in the morning. idles at like 700 im getting a live data reader tomorrow ill post data after. and im not sure how old the pump is after the new fuel filter tomorrow hopefully it will run little better. but yea the pump prob needs to be replaced it hasnt been driven much in the past year so want to get new one anyway