the filter under the tractor is the primary filter, if you follow the fuel line from the back forward it is the plastic one, next is the fuel pump, it is metal but appears to look like a filter. The filter under the tractor is easy to change, pinch the fuel line shut with a vice grip, use a pliers to slide the clamps away from the filter, 10mm nut driver to remove the bolt holding the filter bracket pull the hoses off the filter, reverse steps to install the new filter & you are done. I have problems with something clogging at the outlet of my fuel tank so I am well versed in removing the filter I can remove & replace in less than minutes