There are pros and cons for electric vs. mechanical pumps. Mechanical pumps operate at engine speed and are automatically pressure regulated. They also stop when the engine stops. One down side is that a diaphram leak can cause fuel to enter the pan where it has been known to explode, another is having to crank the engine too long when the fuel has been emptied and then replenished. Electic pumps either need to be adjustable for pressure or require a separate regulator. To be safe, electric pumps should be equipted with a low oil pressure shutoff (bypassed during starting) or with a rollover or crash sensor.
There should be no difference in performance between the two unless you developing more that twice the rated horsepower IMHO.
Bald E. Gull
