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After a fair amount of fiddling I figured out the sequence for this on my 4400/4700

Step 1:  turn off "fresh water pump 1" on the breaker board
Step 2:  turn on "fresh water pump 2" on the breaker board
Step 3: Close the orange valve mounted on the aft side of the bulkhead forward of the water heater (just under the middle floor hatch in the cabin"
Step 4: engage auto fill switch in the galley

The actual solenoid valve for the autofill is located on top of the fresh water tank...you can see it when you open the aft most hatch in the cabin floor

Hope this helps