How long should the fuel system stay pressurized after the engine is shut off?
On my 97 LS all OEM fuel components the fuel pressure only holds for 1-2hours on the fuel filter mounted pressure gauge. I have a rough(misfire) idle on semi cold startups and think its a leaky injector. NO CELS and #1 cylinder plug looks slighty rich compared to the other 3. I have moved the #1 injector over to #2 and will recheck the plug in a few days.

 

1hr

 

1hr at fuel pressure specs??
anyone else?

 

Mine does the smae thing, It'll start to drop off pressure after a few minutes, but it'll hold at around 20 PSI for about an hour. When I start the car the next day or later that day, it is at 0 PSI. I don't know if that's normal, but I don't have any problems, or missing of any sort.

 

not really to sure on my psi but everytime i refuel the pressure sounds is crazy, everytime i refuel could be a few days before each time

 

my guage is mounted on my fpr, it drops off pretty quickly, isn't it just because the fuel goes back down the return ?

 

supposedly its supposed to hold pressure for some time.. need to know how long though..

anyone else with a fuel pressure gauge installed. check you cars after 1 hour 2 hour for fuel pressure please.........

 

hmph, well then mines fubar'd