1995 Ford Taurus Sedan gas tank draining

Trying to drain the gas tank on my '95 Ford Taurus with 265,000 miles. First, tried going in thru the fill tube and fill vent but disovered the anti-siphoning screen.

Then located the gas tank drain tube on the right side of the tank. Tried siphoning thru this line without depressurizing the fuel system because I don't have the special tools to relieve pressure at the supply manifold or open the special coupling fittings. Is there another location I can relieve the pressure without special tools? What other methods can I use to drain the tank or relieve the pressure to I can use the drain tube?

Any other description of how the drain tube system works would be great as well. Thanks.