Thread: Running out of fuel pump?

what are some of the signs of out flowing a fuel pump?

I did some more scanning today just to see how the car was doing. I made a few WOT runs and found out my o2 value dropped from 923 to 830-880 WOT. Im not sure if its because the o2 is hitting the firewall causing it to screw up or my fuel pump is now supplying enough fuel so its leaning out.

You can't trust narrow bands for anything really.


You need to watch fuel pressure and injectors information. Like duty cycle, pulse width to see how the fueling of the car is working.

Or watch your wideband, if you see it going lean. Then you either have a lack of fuel flow from the pump or the injectors arent big enough.