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clinebarger · 04-27-2012, 07:15 PM

A Flex Fuel engine would have stainless fuel rails not plastic. ALL L59 engines are Flex Fuel, You have a LM7 (If its a 5.3L).

Trucks & SUVs went "returnless" in 04, I doubt thats a 06 Tahoe engine.

04-27-2012, 07:15 PM	#7
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: L59 fuel question A Flex Fuel engine would have stainless fuel rails not plastic. ALL L59 engines are Flex Fuel, You have a LM7 (If its a 5.3L). Trucks & SUVs went "returnless" in 04, I doubt thats a 06 Tahoe engine.