Replacing fuel pump after XFI install

[rpk250]

Installed XFI back in January and got the idle and basic parameters set up with Cal. Since then I have replaced the Walbro 255 fuel pump with an Aeromotive 340. I ran a bigger return line and have the fuel pressure set, at idle, the same as it was with the 255. I have driven it around a bit to let the XFI learn and everything seems to be ok. The only thing I noticed is that when I originally set up the idle with Cal. The O2 correction at idle was about 2%. Now at warm idle it is 5.5%. Seems to be idling smoothly though. Is this anything I should give attention to or do I need to change something else after the fuel pump change. Thanks.

 

[Boost231]

In gear correction at idle is going to be different not in gear. You need a happy medium

 

[rpk250]

This was in park at warm idle.

 

[Boost231]

What's it in gear warm idle?

 

[HighPSI]

The pump shouldn't have changed the fueling at idle unless it's drawing a lot more voltage. You might need to bump the injector opening offset up one tick at issue voltage

 

[pacecarta]

he didnt just do pump he did return too and that may have dropped his line on pressure (under vac) that the stock return line couldnt reach

 

[rpk250]

I'll check the O2 correction in gear at warm idle today. If that is at/around 0, then I don't need to worry the idle in park correction? It seems to correct quickly when cruising around. I have seen it get to -11% briefly during light accelerationn 1-3# of boost. Havent pushed any further than that yet.

 

[rpk250]

Warm, in gear, at idle 02 correction is 0-2%. Settled to 0.