[Franco]

Blow air into the hose coming out of the tank, before the bulb. That would clear any obstruction in the fuel line and pick-up tube. Do it slowly, and have a friend stand near the gas cap and listen for a hissing type sound. That would be your fuel tank vent. It lets the pressure inside and out side of the tank equalize. If you dont hear a hissing sound shortly after blowing ait into the tank you probably want to loosen the gas cap. If you dont have a vent that could be the problem instead of a blockage. With out a vent there is no way for air to get into the tank to take place of the gas going out of the tank. It creates a vacum in the tank, The fuel pump only creates a few ( 2 to 5 ) inches of mercury, or vacum - to draw the gas out of the tank. once the tank vacum equals the vacum of the pump it becomes tie and gas isn't going anywhere. If you tank is in the deck ( you'll see the access hatch in the deck) it should have a deck plate that allows you to get to the fittings on the tank that attach to the fuel fill hose and the vent hose. Most of the time it's the deckplate closest to the front.
The smaller hose is you vent hose. You can take it off at the tank and blow thru that and if you should be able to track it down then. If it does not have one, you may want to install one.