so i installed all my aem stuff finally and i have a hissing sound after i turn off the car, i cant remember if it was like that before or not so my question is :is the a relief valve that hisses after you turn the car off? also what is the fuel pressure suppose to be set at with the vacume line on? thanks all

 

i have mine on 48psi and it sounds like you left a vacuum line off

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ITR1150 &raquo;</TD></TR><TR><TD CLASS="quote">i have mine on 48psi and it sounds like you left a vacuum line off</TD></TR></TABLE>

thanks but i dont think it is that because it would hiss when the car was running right? its just when i turn the car off it sounds like there is a pressure release?? anyone? i set mine at 42psi helms says between 36-48 i believe... is there any benifit to goin up to 48 psi

 

i really cant say but I have mine on 48 and 55 line off and my timing at 18deg
car runs high 13's with header and exhaust. hissing noise i recommend someone turn the car off while your observing the engine bay

 

thats what i have been doing, you can only hear it if the hood is up...there has to be somemore info on this come on someone

 

come on someone must have an answer

 

set your fuel pressure with vacuum line OFF. i'm not sure about sound..

btw, page 11-118 and 11-119:

47-54psi with vacuum hose disconneted from fuel pressure regulator and pinched.. once connected, it should read 38-46psi.