Walbro overflowing fuel rail?
 

Earlier I had some problems on running to lean, so I changed my fuel pump to a 190 HP. As I still have the 12:1 disk and 1.8 injectors I am really rich in boost. However, that is not my problem. The problem is that when I lift off throttle and let the car idle it at 14.7:1 for some time and then drops to approx 11:1!

Any ideas?

check your fpr

When I installed my walbro 255 I was having issues with the car for awhile. I unhooked the FPR and now the car idles and drives like it should. I am also using the 1.8 injectors, but I have emange blue too, so my situation might be different than yours.

Vash-

The stock fpr? How? Car runs normal besides the rich idle.. :(

What do you mean "unhooked" the FPR? I presume you capped off the vacuum line that runs to it. What overall effect does this have on fuel pressure?

I took out the FPR and put the lines back to their stock fuel in/out locations. I don't have a clue about the fuel pressure, I don't have a gauge. And any readings from my dyno visit was when the FPR was still in. But the car has had zero problems like it used to since I did this.

The car always didn't feel right at times, and once I put in the 255 walbro forget about it. I removed the FPR and added the RX7 AFM same day and the car has been A OK since then. :)

Vash-

No he means he took it out completly it sounds like yours is not working properly either. A 190 will not flow enough fuel to give you pressure issues like that. I assume you are running stock ecu right if so there will be abit of swing as you bleed off the pressure from your aux fpr and come out of the decel fuel cut. I would not worry about your AFR's being so rich other than loosing economy and abit of performance you aren't hurting the car. The only real solution would be to remove the added restriction of the aux fpr and run larger injectors and an ecu with you can program to your desired parameters this is $$ and abit of work though so if you are happy with the car as it is aside from the above problem then i would leave it alone.

I now see that Vash and Ole have 1.6L engines. I have the 1.8L where the the FPR is a key part of the rail and cant exactly be left off.

Also Vash made it sound like he is not running any FPR at all. Removing an auxillary FPR makes more sense.

Sorry, I meant the vortec

Vash-