[Super73]

I don't think a single pump 340 will keep up with 850+ HP at the crank let alone on the unit. And let me all you, do you want to find out when it goes lean on the unit?


When I first put my truck together I ran fuel Walbro 255's but they were external.

I had mine wired with one always on and the second turned on when I armed the N2O.

You could wire one to a throttle switch to activate it for motor and N2O.


Your tune up should not change as long as fuel pressure stays constant:
1) Does not drop below a base setting on one pump before the second pump kicks in.
2) Your regulator can return the unused fuel that both pumps are supplying together.

AN size and line does not control pressure, a fuel pressure regulator does. Remember, you cant keep pressure without volume to back it.