The other day I changed my fuel pump, I started with 3 bars showing on the fuel gauge. I found that by attaching a line to the fitting from the return line, (starting out with it held high) 
when you lower it below the level of the lower tank, it will siphon almost all the gasoline from the lower tank. When you remove the rubber line from the fitting, gas will start flowing, so be ready. When it stopped, less than an inch was left in the lower tank. I used a 5 gallon gas can to catch it, and filled it about ⅔
when you lower it below the level of the lower tank, it will siphon almost all the gasoline from the lower tank. When you remove the rubber line from the fitting, gas will start flowing, so be ready. When it stopped, less than an inch was left in the lower tank. I used a 5 gallon gas can to catch it, and filled it about ⅔
