Ok recently swapped to 450lph

when im boosting or entering boost it stays at 13.9 will not drop down to 12.5
I have tried this several times just to be sure and went a little giher in boost to about 10psi and will not change. luckily im on e85 so it won't blow up as quick as pump gas


it will not richen up the way its suppose to

any ideas so I dont blow the car up?

 

Is your car running any differently? Does it buck? Stall? Maybe your wideband sensor isn't working correctly.

 

+1 on this. does the car feel any different?

 

Are you logging and getting any counts of knock? My afr gauge was not reading right and after i purchased a new sensor all was good. I see you are using E85 so hopefully you are using an E85 compatible sensor.

 

Aem is a e85 compatible

My sensor was working fine

It feels sluggish when boosting, and when I start the car and try to drive off it feels like a fuel cut and when I depres the throttle its normal again

 

wait. are you tuned for this new FP? you need to get a retune when you get a bigger FP. Im on a wally 255 on E85 and it works out fine (for now) but did you retune after swapping to the bigger pump?

 

whats the fuel pressure at the rail?

 

its already tuned im asking if I the fuel pump is going bad

 

Do you happen to have any starting issues? Can you hear your pump prime? Can you monitor fuel pressure?

 

Prime not really, starting seems fine I can tell it runs a bit lean and goes
Back to normal when im driving the afrs are good, its boost is the issue

Cant tell fuel pressure no guage

 

Double check ALL your vacuum lines, just in case. Pull your pump out and make sure everything is still properly connected.