i actually have a 86 with with a AC 300 and AC 500 running on it
I had the 300 for some time now, and just bought the 500... I honestly find the 500 MUCH more quiet then the 300... this really suprised me, but the noise is from the water running out, not from the motor
and yes if i fill tank allthe way up, they are both quiet
make sure you dont have the AC 500 over a bubbler or something... also check the intake tube, at the top, make sure there is no air trapped in it.. if so, something might be loose... also there is a black peice that i dont think is in my 300, that the intake should attach to just before the motor, make sure this is in place
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