My 85 truck has this same problem, ive tryed two different carbs and i still have the same problem. both carbs are good and run well on my truck, but once its shut off for a few hours or over night the fuel level drops and its hard to start. I don`t think its a carb problem having tryed two different carbs, but i have no idea whats causing this to happen. <img src="/forums/images/graemlins/confused.gif" alt="" />