Not so... just get two Facet 40185 cube pumps @11.5 psi for each side, and run them in series; the 40185's don't have a pressure relief built-in, so you can boost pressure by running them in series AND you have the benefit of some redunancy there at partial pressure. On the bench I tested mine with a digital calibration gauge, and they put out 23psi @35GPH. This is the setup I'm using in the rocket, cost is $50 ea, $200 total. They only draw 1.6A apiece.
Eliminate that POS unreliable mechanical pump!
And get rid of the fuel selector while you're at it.
I got mine from another fine aviation parts establishment:
http://www.yachtsupplydepot.com/mec...tate-electric-fuel-pump-40185/prod_23424.html
The specs are wrong on this page, its a 9-11.5psi pump. Mine put out 11.5psi each.