Ferguson tractor

Took the Ferguson out today and tried to do some work.  All was going well till it suddenly died.  No fuel getting to the pump but fuel in the tank.  Had to add 5 gal to get the fuel to flow again.  Tells me that the in tank screen is blocked.  As long as the fuel level is above the open top of the screen it runs fine.  Have to drain the tank, remove the sediment bowl and screen, and clean the tank.  Ugg.