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Home >> GMC >> 2004 >> Sierra 2500 HD, 2D Pickup, 6.6 2, RWD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 6.6L (LLY) (Introduction) >> Specifications >> Fuel System Specifications >> Fuel Specific Gravity Testing

Fuel Specific Gravity Testing

Use a J 38641-B  Diesel Fuel Quality Tester to measure the fuel specific gravity (API Rating). Follow the instructions on the tool to obtain the proper temperture-adjusted value. This information must be accurate for the proper diagnosis of the fuel system.

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