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Dodge ram fuel tank reads empty when

I have a 1991 Ford 350 Diesel. 2 fuel tanks under the flatbed.I used up 5 gallons of a full front tank, gauge read empty and truck stopped running like it was out of fuel. What's going on? My friend says that a mud dabber may have clogged up the air intake at the top of the tank.He says that by removing gas cap and allowing air to enter the tank, may tell me if the air intake is clogged. What do you think?

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