well since the reason I'm doing it is to empty the tank that'll be kind of hard to have it close to empty lol....this car sat for 12-13 years and the gas has got to be junk although I have smelled worse stale gas than this, it stinks! I'm just happy the tank is plastic as I do a lot of classic cars that are steel and of course have the rust issues too...I've had both of the valves open only to have a dribble come out and the tanks may have been empty already, thats why I had to ask about flow and procedure....with the key on engine not running the gauge says a little over 1/2 tank....so If it's sposed to pour out with drain button(s) dpressed then mines empty... the gauge is wrong and there was just residual stale fuel left....thanks, and please advise if you think of anything else....Cliff