A really cool trick to avoid spillage that I've used many tims, is to put a shop vac into the filler neck. Make sure it's in there loosely, you don't want to collapse the tank. Turn it on, and then start removing the hose and screen. I've done this with tanks that have several gallons in it and not dropped a drip with the screen completely out. But be warned if the shop vac hose falls out you'll have a huge mess. So keep an assistant attending the hose. Also DO NOT DO THIS ON A GAS TANK, diesel only. The gas fumes can ignite, where as diesel will not.

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