- Barry - yes the problem is that I can't get that siphon valve to turn. It's in a difficult place to get any torque on the wrench and there's the sealant too.The fuel line is connected to the anti siphon valve which is connected to the pick up tube. Use an open end wrench to unscrew the anti siphon valve from the pick up tube. Make sure to keep a wrench on the pick up tube fitting so you do not torque it when you unscrew the anti siphon valve