You can test the existing pickup tube for a leak with a pressure test. You'll need a bicycle pump and a U-tube manometer.
Without leak, you can pressurize the tube (measured in inches of fuel) to the depth of fuel above the bottom of the tube. As you add fuel to the tank, you'll find that the pressure will increase as the fuel gets deeper.
With a leak, the pressure will bleed off to nothing until the fuel level gets up to the leak. As fuel level goes above the leak, pressure will indicate the depth of the leak below the fuel level.
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