I bought a siphon pump but it didn't work
There is an anti syphoning device in filler tube it doesn't say why you want to bypass this device if its to remove tank for changing then you can connect an electric fuel pump to fuel line at engine and empty tank that way
Ray's answer is correct. In all newer cars (for the past 10 or more years) there is a device (a screen usually) down inside the fuel filler neck which is primarily there to prevent foreign objects from being placed into your tank, such as candy bars that will gum up the fuel line and cause the engine not to run. Of course this works two ways in that it also prevents the introduction of a siphon line into the tank.
Due to gas thefts becoming more prevalent when gas was either hard to come by or expensive or both, many manufacturers installed anti-siphon blocks in the gas tank filler necks of many vehicles. These can sometimes be gotten around by judicious fishing of the inlet tubing down through the gas filler neck, but it can be very hard on some vehicles. Try measuring the distance from the bottom of the gas tank to the top of the filler neck with a yardstick. You can hold the bottom of the yardstick approximately at the bottom of the tank as you can see it while kneeling down beside the back tire and note the distance to the filler tube. Mark off that distance from the end of the inlet tubing for the siphon and put a heavy mark on the tubing at that point. If you can\'t get the inlet tubing down the filler neck to this mark, you probably aren\'t going to be able to successfully siphon gas. You can try twisting the tubing as it goes down the filler neck and pushing it up and down to see if you can snake by the anti-siphon block. It helps if the siphon inlet tubing is small and stiff, but again, no guarantees.
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