123 240D. The fuel gauge never goes much above about 2/3 no matter if full and doesn't go below 1/3. The warning light is not working either (don't ask how I know!).

Any ideas as to the root of the problem?

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.