What am I missing
My driveway is a little hill and i was low and fuel so of course I sucked in air. I out in 3.5 gallons of gas parked in garage. ( it's level) and tried starting for Ever then I unhook fuel lines and suck fuel to the end it's a steady strem of fuel, not a strong one though so I lift up the line to put it in the fuel pump and it looses it's syphon. So I do some searching online and lots of people say you have to put at least ten gallons to get it going again. Why? A friend of mine said he put 3 gallons in and couldn't get it to start till he put in half a tank. Man my eyes are burning got a headache all from syphing for nothing. What did I miss is there a valve in the tank that's got to prime or something?