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There are very few FBO's these days who will defuel. It is considered contaminated fuel once it comes off an airplane, as it has not gone through the FBO's supply chain and inspection procedures and is really an unknown quality. Not to mention the state of the airplanes fuel tank interior. Any FBO that puts defueled fuel into another aircraft is severely opening themselves up to liability, and most of them know it.
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FBO I worked at, over 20 years ago, had a truck that was capable of defueling and had some sort of filtration, but they would only defuel at the request of the maintenance shop, and even then the fuel was drained into large plastic trash cans (that the maintenance shop kept just for that purpose, so they were clean), then sucked up with a hose from the truck. That allowed a mechanic and the line guy to watch for any visible contamination in the fuel. I haven't got a clue how it was billed, though.
In more recent years, I've seen fuel either condemned (mostly ended up in ground vehicles of various types), or drained into a fuel cart in the maintenance shop, then later put back into the same plane (with a filtration system on the cart).