So I bought this to facilitate faster easier refueling of my jeep a fuel caddy or jerry cans when on extended backcountry trips. Within a day or two of receiving my gas tapper the fuel pump in my Silverado went out, to fix it we had to drop the fuel tank. I told my son that if he would do it, he could fill up his van from my truck using the Gas Tapper. He fairly quickly opened the box, figured it out, and drained about 20 of 30 gallons. It solved my problem and he got a free tank of $5 per gallon gas. He said it worked good and I'm pretty sure he didn't even bother with the directions.