If it's loosing pressure just sitting, you can find where by putting it under water and watching for bubbles or spray it with a water soap mixture and look for bubbles. It could be a dirty seal in the top or leak in the fittings where the hose connects to tank or handle.
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If it's loosing pressure just sitting, you can find where by putting it under water and watching for bubbles or spray it with a water soap mixture and look for bubbles. It could be a dirty seal in the top or leak in the fittings where the hose connects to tank or handle.