Last weekend I filled up my 2001 X5 3.0 and the gauge stayed at 1/2 tank. I figure that the sender unit went south. Does anyone think that the sending unit will ever find home again? Now it reads 1/4 tanks and seems to go down with driving. Any good tips? I hate to go to the stealer.... Thanks

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2009 X5 3.0i, 2005 Volvo XC70, 2011 VW GOLF TDI2002 Jetta 1.8t, Ford F250 Diesel