Use of Red Diesel Fuel in 6.5L or 6.6L Diesel Engines - kw dye hard INJ INT LB7 LLY L49 L56 L57 L65 miss P3 pump stall start

The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.

Dealer notices red diesel fuel being used in vehicles equipped with a GM 6.5L or 6.6L diesel engine.

Red diesel fuel will not cause any problems when used in the fuel system of vehicles equipped with the GM 6.5L or 6.6L Diesel engine. Red fuel will not induce trouble codes. Accordingly, warranty decisions should not be based on the discovery of red fuel in the fuel system or the injection pump of a GM 6.5L or 6.6L diesel engine.

Federal regulations require certain diesel fuels be colored with dye for tax purposes. Diesel fuel injection pumps have been tested with various dyed fuels and have been found to operate satisfactorily with such fuels. Water or other fuel contamination is not covered under the Stanadyne and Bosch warranty regardless of whether the fuel is dyed or not. All GM vehicle owners manuals state to use a #2 diesel fuel. A change is being made to the service policies and procedures manual, section 4.6.6 to reflect this information. With regards to legality if a customer requests to know what fuel is legal for them to use, refer them to their local government agency for handling. Please refer all inquiries to this document.

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance.

(94 95 96 97 98 99 00 01 02 03 04 05 C1 C2 C3 K1 K2 K3 G2 G3 P3 LB7 LLY L49 L56 L57 L65 6.5 6.6 Chevrolet Silverado Express GMC Sierra Savana GMT800 GMT400) and (03 04 05 LB7 LLY C4 C5 D4 D5 E4 E5 6.5 6.6 Chevrolet Kodiak GMC Topkick GMT560 )

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