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FUEL TANK FILTER 304 E

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My machine is a 304 E CAT excavator. I have a warning light that came up on my display that says: "! Fuel Tank Filter Change". It was green at first, now is orange. It has been on for about 10 hours. I contacted CAT twice about it, and even drove 100 miles the the CAT Dealership with a photo I took of the display. They spent about an hour on their computers, and told me they don't know what it is. Can someone please help??