so I'm kegging for the first time I hooked the gas up at 8 psi for a pale ale 5 gal batch it's been on gas for over a week, I just hooked up the liquid line and nothing is coming out of the keg? It's a pin lock corny keg I hooked up the gas to the short tube side and liquid to long tube inside of keg, was this right? I just want to sample and can get nothing out please help, thanks.