Did you recently fill the fuel tank to overflowing? Sometimes you can get fuel pushed into the breather hose. If there is any sort of dip in the hose, the dip will fill with fuel and keep air from passing. Try pulling up any slack on your fuel line to take any bow out of the line. You can also try blowing air into the breather hose to force any fuel back into the tank.
Another possibility is that you are using Mecury Quicksilver fuel lines. These lines have a thin liner on the inside of the hose that is affected by Ethonol. The liner will collapse making it impossble for fuel to be drawn through. Think of drinking a chocolate shake through a very thin straw.
How these idea help. Good luck.
Rob
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