I did this once sa owner ng father in law ko. Fuel line goes to a 4 liter plastic container instead of the fuel tank. Nakakatawa nga when I fill up sa gas station, kasi you just give the plastic container to the gasoline boy hehehe. At least makikita mo kung konti na lang natitira sa fuel mo. Simple disconnect lang ng tubo. Pero di advisable sa kotse baka magspill pa, and fumes from the fuel might suffocate you.