hi i have a 1978 peugeot 103 in awesome condition but it didnt run and i never had the motivation to try to get it running again(to interested in my puch) but the other day i got bored and decided to fix it, i poured alittle gas in the cylender put the plug on and peddled it, it fired right up! so then from there i drained out all the old gas and put new stuff in. then i realized that the reason it wasnt running was because of the carb(dirty or clogged) so i took it apart cleaned it and put it back together. now when i turn the petcock on no gas flows thru the fuel line when its attached to the carb and when it isnt attached it flows fine. what could be my problem? any help is GREATLY APPRECIATED!