We have a Skag FreedomZ 725cc 26.0 hp Briggs and Stratton. Will start with starter fluid for a few seconds, have gas flowing at the carburetor, but i don't think it's going into the carburetor. Is there any kind of switch that would possibly keep gas from flowing into the carburetor? TIA ( It ran fine last time we mowed, which was right before all the flooding here on Lake Texoma).