The testing with the pump installed was with the stock 2.0 seat. Pumpless I was running the 3.0 grizzly valve.
Even with the Grizzly valve under gravity the float running level will be much lower than with the pump installed. The pump can supply a lot more fuel when the float valve first starts to open than the Grizzly valve can with gravity feed.
If you're a tinkerer and want to test this then before removing the pump hook up your float level tube and start the engine. With the choke all the way in make a note of the fuel level and then pull the choke all the way out. Mine drops 1-2 mm
's with the choke out and stays there. I can also feel the pump speed up slightly to keep up with the demand.
After the Grizzly valve is installed and the level is correct check the level change between normal idle and with the choke pulled out. The level will drop a LOT more before the valve is open enough for gravity to keep up with demand.
Even after I raised the float level quite a bit with the Grizzly valve mine would still suck the bowl dry at 95, 4th gear full throttle. I thought about leaning the main
out but the plugs are just right and it pulls hard.