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The oil pump is inside the oil pan of the engine for all Avalanche models 2002-2011, including the 5.3L and 8.1L gen III Vortec engines available in the 2003 model year. It sits down in the "sump" or the low spot where the oil accumulates after running through the engine.

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Bonita Tromp

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2y ago

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The oil pump is inside the oil pan of the engine for all Avalanche models 2002-2011, including the 5.3L and 8.1L gen III Vortec engines available in the 2003 model year. It sits down in the "sump" or the low spot where the oil accumulates after running through the engine.


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