Ok so we replaced all the fuel lines, rebuilt fuel pump, and tore carbs down for cleaning. After putting everything back together we can't seem to get fuel sucking out of the tank???? I tried blowing on on the outlet hose to compress air, no luck. Sled ran fine before we did all this so I'm kind of lost. Pick up hose was replaced in tank and is definately on the bottom of tank, all hoses are secure and clamped. Any ideas? I thought next we could fill the carb bowls and see if we could get it primed that way.