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If your tank isn't already equipped for a breather, you will need to install one. When working with any type of 90-degree fitting, always make sure there is enough clearance for it to thread in before drilling the hole. We then drilled the tank and welded in a threaded bung. Once you're done welding a steel or stainless steel tank, be sure to do a pressure test (or at least a leak check with water) to ensure there are no gaps or pinholes in your tank before filling it with fuel.