regulator or relay?

 

I think he means regulator.

Did you check the vacuum hose that goes to the Fuel Pump Regulator? The one under the valve cover cover.

 

Yes, I thought it was the regulator at first too but I bought a brand new aeromotive A1000-6 and doublechecked all connections and especially the vacuum line. I'm gonna try and put the stock pump back in today and see how that goes.

 

UPDATE:

So I got a new walbro 255 and now it's really rich under boost. The trims were actually positive, so I increased the base fuel pressure a bit and now the trims are good once again. The car acts like it should everywhere except for under boost. I rechecked for boost leaks today and everything was good. Now, the values in my map are mid 11's under wot, but the car is like 10.0 to 10.3. Why is it doing this if the trims are good? Shouldn't the actual AFR's be what is in the map if the trims are good? Should I just lean out the values in the map more or what? My MAF scaling is stock but obviously scaled the injectors and set the latencies.

Thanks!

 

no the map AFR's dont match the actual AFR's at all...

if your trims are right about 0, then you should slowly lean out you fuel map until you hit your target of 11.5 AFR

 

Wait so are our X's supposed to Run 11.5 or 10.0 under boost at WOT?

 

So...it was the friggin pump?!?

I'm having the same problems and I just ordered a new pump. I am praying that's the problem.

I hope I install it and I'm at like 9a/fs

My Fuel map is pretty much bottomed out to get high 11 a/fs right now.