I can't get any gas into the engine. I've tried three different gas lines that don't have any air leaks. I just keep pumping air into the gas tank. I've just recently ran this engine and it ran fine. I checked the fuel line to the fuel pump and didn't see anything wrong. It was out of water today while I was trying it, would that cause it? I use to have no problems pumping gas in it while it was out of water. What else could it be?