Tell me this is ok
03-27-2007, 05:01 PM
#1
Registered User
Thread Starter
Join Date: Oct 2005
Posts: 58
Tell me this is ok
Checked my fuel pressure at idle it was 39 not 43-47 and with the vacuum line from the regulator off it went up to 40. Also checked the vacuum at the regulate constant 18 snap throttle great 0-25. Just tell me that is all good in the hood couldn't observe F/P while driving need a longer hose?
03-27-2007, 05:06 PM
#2
Administrator
Join Date: Nov 1998
Location: Hell was full so they sent me to NJ
Posts: 70,673
Seems odd that the pressure only changed by 1psi when you pulled the vacuum line off. 18"Hg is the same as 9psi.
It should be 41-47psi with the vacuum line off, and drop proportional to intake manifold vacuum when you reconnect the line, a 6-8psi drop on a stock cam.
It should be 41-47psi with the vacuum line off, and drop proportional to intake manifold vacuum when you reconnect the line, a 6-8psi drop on a stock cam.
03-27-2007, 09:37 PM
#3
Registered User
Thread Starter
Join Date: Oct 2005
Posts: 58
could a fuel filter cause such a pressure loss.
03-28-2007, 09:49 AM
#4
Registered User
Join Date: Dec 1969
Location: San Diego, CA
Posts: 4,950
Filter is on the feed side of the fuel system so a clogged filter wouldn't cause the 1 psi delta with the vacuum line on/off. Make sure the vacuum line isn't cracked and no gas is in the line (from a leaking FPR). What rpm is your idle at?
03-28-2007, 05:10 PM
#5
Registered User
Thread Starter
Join Date: Oct 2005
Posts: 58
1000rpm the line didnt seem to be cracked and I saw no leaking gas anywhere.