lt1 fuel pressure drop
06-07-2013, 03:05 PM
#1
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lt1 fuel pressure drop hey, I have 96 impala ss, le2 383 with 36lb injectors, 255lph pump(do not have the hotwire kit) stock regulator, its at around 46psi with vac on. when i rev it it drops to about 40psi. is this normal or is something going bad? thanks
for any help.
for any help.
06-08-2013, 10:55 AM
#4
you haven't the foggiest idea what you are doing.
The regulator's job is to keep fuel pressure steady when compared to manifold vacuum, what this means is when read by a gauge referencing atmospheric pressure is at times of high vacuum the fuel pressure will appear to drop and appear to rise under low vacuum conditions like WOT.
At idle with the vacuum line on 46 is high, that is about what I would expect with the vacuum line off simulating no manifold vacuum/WOT. Manifold vacuum will spike when you close the throttle after the rev and then you should see the needle drop.
Check the pressure with the vacuum line disconnected.
The regulator's job is to keep fuel pressure steady when compared to manifold vacuum, what this means is when read by a gauge referencing atmospheric pressure is at times of high vacuum the fuel pressure will appear to drop and appear to rise under low vacuum conditions like WOT.
At idle with the vacuum line on 46 is high, that is about what I would expect with the vacuum line off simulating no manifold vacuum/WOT. Manifold vacuum will spike when you close the throttle after the rev and then you should see the needle drop.
Check the pressure with the vacuum line disconnected.
06-08-2013, 09:09 PM
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you haven't the foggiest idea what you are doing.
The regulator's job is to keep fuel pressure steady when compared to manifold vacuum, what this means is when read by a gauge referencing atmospheric pressure is at times of high vacuum the fuel pressure will appear to drop and appear to rise under low vacuum conditions like WOT.
At idle with the vacuum line on 46 is high, that is about what I would expect with the vacuum line off simulating no manifold vacuum/WOT. Manifold vacuum will spike when you close the throttle after the rev and then you should see the needle drop.
Check the pressure with the vacuum line disconnected.
The regulator's job is to keep fuel pressure steady when compared to manifold vacuum, what this means is when read by a gauge referencing atmospheric pressure is at times of high vacuum the fuel pressure will appear to drop and appear to rise under low vacuum conditions like WOT.
At idle with the vacuum line on 46 is high, that is about what I would expect with the vacuum line off simulating no manifold vacuum/WOT. Manifold vacuum will spike when you close the throttle after the rev and then you should see the needle drop.
Check the pressure with the vacuum line disconnected.
Had you not had that first line in there you would have given some great advice AND not seemed like such a *****.....
