[One Tough Pressure]

You said new filters, so does that include the fuel filter that sits half way under the air cleaner housing? The hose that runs from the filter to the fuel pump is very short and weak. If you were to have pulled a little to hard when changing that filter, it may be pinched. When it gets a little warm it softens up and allows enough flow to keep it running.

Pull the little plate that says "20hp" from the front of the engine. It is small and black and held with two screws. You can then see the hose and the tight loop that it makes, and determine if it is pinched, without pulling the entire air cleaner assembly.