Originally Posted by Bulldogger
It's not the difference in pressure, it is going from 55-60g/h (stock) to the 95g/h that the SL55 pump gives you. Up top you are loosing pressure in the rail due to lowered volume. The SL55 pump adds 35-40 more gallons per hour.
Regardless of the pump, going from 56 psi to 76 psi fuel pressure equals an increase in 16.5% more fuel : sqrt(76/56)=1.165 if the pump can keep up, as stated earlier.
Yes the stock pump is inadequate, but the point I was trying to make was that more fuel pressure means more fuel delivered, with the caveat stated in the original post.