I have a 2003 with a 300 HP Cummins 5.9 and am dealing with a stopped up filter.
Inside the frame rail between the tank and lift pump is a Racor inline fuel strainer. Mine was stopped up with rust and other debris.
I replaced the inline fuel strainer and the Fuel filter/water separator and the engine runs just fine.
I am now circulating the fuel through a filter/water separator via an external pump in the attempt to clean more debris from the tank.
When I complete that task today, I am going to move the Racor inline fuel strainer to a location that will be easier to change. I am also adding a shut off valve so I can perform these maintenance items without taking a bath in #2 diesel.
Open the water drain on your filter/water separator and see if you are getting fuel.
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