I would have done it already, but dropping the tank is a real pain on these things, and the fuel sender needs modification for the larger sizes.
I may up the return line to 5/16" since I could use a stock supply line I have laying around.
Modifying the return tube of the sender isn't bad.
I did make some progress today, I can FINALLY run it in closed loop without it yanking fuel/throwing fits and going lean as H*LL.
Through comparison of the WB gauge to AFR displayed in TunerPro I noticed that stoich wasn't being reported as 14.7
Tunerpro was reporting 15.5 AFR when WB gauge was showing 1.0 WTH?!?
I've been fighting with this thing forever, and was ready to light it on fire and roll it down a hill.
Open loop it would run great, every time I would re enable closed loop it would have a fit.
Even on the 7747 it was doing the same thing, and with no way to get the AFR into the datastream I NEVER would have seen this.
I've been driving this thing around in open loop for months, kind of defeats one of the main benefits of FI.
So I messed with the WB analog outputs.
I changed them gradually until 1.0 on the WB display was = 14.7 reported AFR displayed in Tunerpro.
Enabled closed loop, fired it up and BAM it runs like it should.
Now the previous analog settings worked my other truck and it was running fantastic and very easy to tune w/ the WB.
That truck has virtually the same set-up, but runs a lower FP and the VE tables aren't maxed out as much.
Why I would have to change the analog outputs that worked fine on the other truck to accommodate this truck I have NO IDEA.
I'm soooo sick of this truck, but we'll see if I'm finally the blind squirrel who found his nut?
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