Odds are a bad or sticky gauge in the tank, usually part of the fuel pump assembly. Check your chassis dealer who will know.
Doubtful you could do it but check some u tubes if you want to try. Caution, lots of weight if the tank has much gas in it. Really a dealer thing if you are not really repair handy and have the tools.
Not likely but maybe some fuel cleaner might help free the sticky gauge.
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