There are 2 metal screens, 1 in the tank and 1 close to the fuel filter. Both of ours clogged last year everytime the fuel tank got low. Drained the fuel this winter and flushed the tank. Just yesterday, omce again, the screen next to the fuel filter clogged full of plastic cuttings from the manufacture drilling the holes in the tank. We must not have gotten the tank flushed well enough.