[Anthony]

Well,

I think I have had problems with fuel starvation while drag racing, about 1/2 way down the track.

I'm using both 6 AN lines as supply lines, the bottom (reserve) fitting on the cell going to the trunk electric pumps, and the upper fuel fitting on the cell going to the engine compartment to feed a carter mechanical pump. No return line. Both lines then merge into a single 8 AN line. I'm getting ready to mount another electric pump down by the tank, as the "stock" electric pumps don;t seem to pump that well.

I would think if you are running a Hi-Flow electric pump with higher pressure, you'll need a regulator, but not with "stock" electric or "stock/street" mechanical pumps.

I would say remove the regualtor and then check the pressure.