In practice though, this is very difficult and time-consuming to do. In theory, you can bypass the rollover valve with the right tools. Most rollover valves are either ball or butterfly-type valves. Method 3: Bypass the rollover valveĬar rollover valves allow gas to enter the tank in one direction only. But, if it also has a rollover valve, then you’ll need to bypass this too (see method 3). If the car only has an anti-siphon screen, then you’ll be able to siphon gas after breaking the screen. You then feed the pipe into the fuel filler tank and use the ring at the end to break the screen. One solution is to make a copper ring and solder it to a copper pipe. Copper wire by itself probably won’t be strong enough to puncture through the screen. Because copper has high conductivity, it generally will not create sparks. And a spark could result in a massive fire!Ī good solution is to use copper. The problem is that metal-on-metal can create a spark. You’ll need something long and sharp to puncture the anti-siphon screen. I don’t recommend this because you could end up blocking the fuel outlet if any part of the screen falls into the tank. It is possible to break through the anti-siphon screen in a car. Your siphon hose will be able to reach some of the gasoline to siphon it out. Just park the car on a steep slope so the filler is downhill. It works because the anti-siphon screen is usually located quite far down the neck of the fuel filler pipe. If the car has an anti-siphon screen but does not have a rollover valve, then you can probably siphon most of the gas with this simple trick. How to Bypass Anti-Siphon Valve Method 1: Park on a Slope This valve is actually meant to keep gas from escaping the car in event of a rollover but it also prevents you from sticking a siphon hose in the tank – hence why it is often called the anti-siphon valve. The second device is a “rollover valve” located at the tank inlet. This is typically located higher up in the fuel filler pipe. It is a mesh screen that prevents you from putting anything solid into the gas tank. There are actually two devices that can prevent you from siphoning gas from a car. You will need to bypass this if you want to get fuel out of the tank. Unless you are trying to siphon gas from a really old car, chances are that it has an anti-siphon device. But wait – the car has an anti-siphon valve! A squeeze-bulb type siphon will make the job a lot easier. *Don’t use the old method of siphoning gas with your mouth! The risk of getting a mouthful of gasoline is simply too great. Squeeze the valve and it will suction the gas out of the tank and into your canister. Remember that siphons are one-way devices so make sure you put the right side of the hose into the tank. Stick the siphon hose into the tank and the other end into a fuel canister. Use the screwdriver to push the flap aside and hold it open. To bypass this, all you need is a long, skinny object like a screwdriver. The flap allows you to insert a hose in but will jam when you try to remove the siphon hose. Use screwdriver to push aside flap over filler pipeĪlmost all fuel pipes have a little metal flap over them. You can use a crowbar or the claw on the back of a hammer. Even if you don’t know how to pick a lock, it’s pretty easy to open the fuel door with brute force. You just need special tools, know-how and a lot of ingenuity. However, it is really difficult to siphon gas from modern cars because they have anti-siphon valves and devices in them. You could use the siphoned gas to fuel a generator or to refuel your vehicle during evacuation. While I definitely don’t recommend it, knowing how to siphon gas is an important skill to know for emergencies.
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