Then your B4001 table is incorrect, it should be flat.
To run MAF-less (SD) you want to see any one of the MAF DTC's, is this what you see...?
Interesting, I always thought for the return fuel system with the FPR you need to adjust B4001 to account for the pressure various manifold vacuum pressures.
And yes I always get p0102 - is there any way to get the system not to display p0102?
2002 GMC Sierra ECSB
Turbonetics T7675 6lbs boost, 42lb injectors, Single 4 inch exhaust with Hi-Flow Cats, 6.0 swap, Comp Cam LS9 Cam, EFIlive Tune, E-fans, Snow Performance Meth Kit, soon to add KB Boost a Pump,