car goes lean on b2b pulls - SRT Forums

Brian87gt · 11-01-2009, 10:50 PM

I'm in the process of tweaking on my car and here's the situation. Fuel system consists of 2 255 pumps, one in tank and one inline. As well as 750's and a return line, rewire and bottleneck fix. First pull I make the afr's are normal, but when I hit it again, maybe 30 seconds to a minute later the car in the teens on the wideband. The car had over a half a tank of gas in it. Any ideas?

Xx_R/T_xX · 11-02-2009, 03:22 AM

idc on the injectors is to high..ur injectors seem to get "TIRED"and dont pump out as much fuel as they did on the first run

Brian87gt · 11-02-2009, 07:43 AM

Quote: Originally Posted by Xx_R/T_xX

idc on the injectors is to high..ur injectors seem to get "TIRED"and dont pump out as much fuel as they did on the first run

How do i fix it?

d_fl8ted1 · 11-02-2009, 08:35 AM

get bigger injectors or turn up your fuel pressure a couple psi..

you need to log to make sure that is the case

i have seen where the gas line inside the tank that runs from the intake walbro to the outside of the tank cracks and causes air to get into the line... i had a customers car do that to me down here... so check your lines inside and out..

RiVal · 11-03-2009, 06:18 AM

Mine did this also(well somewhat)
I boost leak tested and found that the Adjuster Bolt on the FPR had a slight leak. So it would bleed see less boost than I was pushing leading to lean afr's..
For now I used gasket sealer on the bolt and so far no leaks..
Its a just a thought....

CarsAddict · 11-04-2009, 01:18 PM

get bigger injectors or turn up your fuel pressure a couple psi.

d_fl8ted1 · 11-04-2009, 01:36 PM

Quote: Originally Posted by CarsAddict

get bigger injectors or turn up your fuel pressure a couple psi.

99 percent sure that is wont will fix it...