Water in Fuel Sensor, 2001-2011-m
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Water in Fuel Sensor, LB7 LLY LBZ LMM LML, 2001-2011, Duramax

OEM replacement sensor
Part Number: 12639277  
OEM replacement sensor 

2500HD 3500 Silverado Sierra 6.6L V8 Duramax diesel: 
2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
Over time, the water in fuel sensor can be damaged from improper removal or just use over time.  The wires can break off and not allow proper sensor operation.  This could prevent the water in fuel light from coming on and warning you of potential fuel system problems.

100% new sensor
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