If alot or a little gas is still dangerous to work around ---depending on reason to remove old gas such as replacing fuel pump dropping tank easiest way but is just to get fuel out need to separate the flex connection between the fuel filler neck and the fuel tank and install a siphon tube to get most of fuel out safely
Curtis, Not an easy task to siphon out of GM's, may have to take the filler tube off to get a siphon hose to go past the back flow ball found in a lot of GM's. There are other ways, just be very careful as gas is very flammable and can be dangerous. Check the attached links,instruction and guides, Good luck
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