Thank you for your reply and info. If not clogged with sand, any idea on what would keep it from running if the gas isn't pressed? Carb air/gas mixture?

Sorry. I couldn't find a way to add the pics on the original post

I have a 74 f250 that starts fine but won't stay running unless your foot is on the gas. Lost a gas cap awhile back and I ordered a new one. While driving it without the cap It started running rough and dying. I took the fuel filter off and found the gas in the bottom of the filter cup was...