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I would check your fuel tank breather, located up and behind the fuel tank filler. This is always moist from the relief operation and is a great place to catch all the dust that billows out from the rear wheels. The tank will pull a negative pressure if the volume of fuel is not replaced with air. It won't matter how good your fuel pump is - if the breather is blocked, which is indicated by the 'whooshing sound' when you open the tank, you will cease to draw fuel to the motor - seen it on 3 tanks so far. Also, you may find the vent line is plugged up with dirt as well, so the hose may need removing - don't just blow it clear with an airline whilst connected to the tank as the muck will go straight back into the tank.