I would not use air pressure to push out the dent. You can't control the expansion of a vapor. I would use a port-a-power and fill the tank with a cheap grade of oil then heat the dented area. When under slight pressure and it's heated the dent will push out slighty and pressure will be gone and you'll have to pump it up again. When using a liquid it is controllable since it can't be compressed, it can only pressurized and any little movement in the vessel will relieve that pressure in an instant. So you can push the dent out slowly. Compressed air will keep pushing until the pressure is gone or the air has completely expanded. We use to push dents out of hydraulic cylinders on fork lifts all the time this way. We heated up the dented area and used the vehicle's hydraulic system to push the dent out. We were taught never to use compressed air, even 6-8 lbs can cause injury or death. It looks like you have a dent 8" x 10" so this is 80 square inches and at 6 lbs of air pressure you have 480 lbs pushing on that area. It never quits pushing until all the air pressure or air has expanded. Not a good idea to use compressed air. Any gasoline fumes that may be in there and put under any pressure are highly explosive.
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