Weird. Is there air in the lines? Does water come out smoothly when you open a faucet?
The noise you describe occurs when the tank is empty because the pump is sucking in air. If it's making the same noise and the tank is 3/4 full, you might be sucking air into the pump through a leak. Check to be sure the hoses are tightly attached (hand tight) to the pump and that the hose has a watertight connection with the tank.
Dave
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2000 2720SL & 2007 3124KB
2005 Toyota Sequoia
Twin Battle Born 12v 100Ah LiFePO4 (BBGC2) batteries, 300W solar on rear shell, Link 10, Lift kit, Maxxis 8008 225 75/R15 E tires
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