Fuel pressure issues with forced induction
08-01-2009, 10:08 PM
#1
Staging Lane
Thread Starter
iTrader: (15)
Join Date: May 2009
Location: Columbia, MD
Posts: 54
Likes: 0
Received 0 Likes
on
0 Posts
Fuel pressure issues with forced induction I have a 2000 Trans Am with a vortech supercharger putting out 6 lbs of boost. I just bought the car and was told it needed a new fuel pump so because the fuel pressure dropped from about 54 at idle to 45 under WOT. I bought a racetronix pump with a hotwire kit and now I am still getting the same problem. The car runs very strong and pulls hard...no hesitation or sputtering is going on. I was told I do not need a boost reference regulator due to the fact that I am not putting out that much boost. I am going to replace the fuel filter this week but I do not think that is the problem. Any help would be appreciated. I have also posted this under the fueling and injection section but thought maybe someone with forced induction would know a little bit more about my situation.
08-02-2009, 07:27 AM
#3
Teching In
Join Date: May 2008
Location: millbrook,al
Posts: 14
Likes: 0
Received 0 Likes
on
0 Posts
I had this similar problem on my 01,Install two pumps and have the primary come on with the switch as normal.The second Ive got power to it via a hobbs switch.Go to the twin walboro install and it will solve your problems.I tried all the same things, drop the tank about 4 times and finally did this install.Its nothing to it just take your time.
08-02-2009, 10:50 AM
#7
A stock setup should not drop to 45 psi. Maybe 2-3 psi. If you're dropping 15 psi then you have a problem with a restriction in the line, the stock regulator is bad or there is a problem with the hot wire. Not sure that even if those 42# inj were going static that they could pull the fuel pressure that low (when everything is working right). What power level are you at?
Trending Topics
08-02-2009, 10:54 AM
#8
A stock setup should not drop to 45 psi. Maybe 2-3 psi. If you're dropping 15 psi then you have a problem with a restriction in the line, the stock regulator is bad or there is a problem with the hot wire. Not sure that even if those 42# inj were going static that they could pull the fuel pressure that low (when everything is working right). What power level are you at?
08-02-2009, 11:08 AM
#9
The injectors can only deliver the volume that they can deliver. 42# injectors at 100% duty cycle shouldn't be able to pull the pressure down that hard.
08-02-2009, 11:50 AM
#11
Come to think of it, not too long ago, I had a buddy with the same problem and we switched the pump and it didn't fix anything. Turns out it was his alternator. It was only putting out like 12.2v. Might want to look into that.
08-02-2009, 02:27 PM
#12
I don't see how it wouldn't. There is positive pressure underneath the injectors reducing fuel pressure in that amount of the boost. I was under the impression that it was the purpose of having a boost ref reg after the rails, to get rid of the drop and have a steady fuel pressure, and in boosted applications compensate for the positive pressure created
08-02-2009, 02:50 PM
#13
I don't see how it wouldn't. There is positive pressure underneath the injectors reducing fuel pressure in that amount of the boost. I was under the impression that it was the purpose of having a boost ref reg after the rails, to get rid of the drop and have a steady fuel pressure, and in boosted applications compensate for the positive pressure created
