2 pumps are common. The one near the tank is probably a low pressure priming pump (these are installed to pull gas out of the tank and get it to the second pump). The pump near the motor is probably the high pressure pump (these are great for pushing a lot of pressure, but don't pull worth a damn... that's why the priming pump is there to get the gas to the high pressure pump). If you had a high pressure pump inside the tank, that would work fine by itself because it only pulls the gas a few inches from the pickup tube.
And it's pretty normal for electric pumps to make some noise.