Would it be possible to use an old fuel tank to store water for watering my garden? I don't know whether it was used for diesel or gas, but it's been at least 5 years since it's had anything in it. Would there still be too much residue to safely use it for watering? If it's okay, is there anyway to attach a garden hose to it (the gas hose is shot)? I know it wouldn't support a sprinkler (it's just gravity fed) but I could put a watering attachment on the hose and gently water my plants. It would save so much time dragging out and putting away the hoses several times a week since the nearest working hydrant is 250 to 300 feet away from my garden.