Hey Group:
My 4400 sat for a couple of months over the winter. I recently hauled a load of leaves to dump, and on the way home it began to starve for fuel. I limped it home with full choke on.
On inspection, I see that the fuel filter at the carburetor has no fuel in it. I disconnected the fuel line coming from the tank, and it spits out fuel freely, no problems. Also, the glass bulb on the fuel pump is full of fuel. My prime suspect is a failing fuel pump; I thought I'd run it by the group for confirmation. THANKS!