text: how do i make a home made syphon hose with its valve, in order to get gasoline out of a tank ? what materials do i need to make the extracting valve which is attached at the end of the hose and how do i built it ? it is much easier to use two hoses instead, one for draining the gas, the other a shorter smaller diameter hose used to blow into the tank. blowing into the tank forces gas to come out the larger one. you must seal the tank opening with a rag when doing so . no problems