Between Omaha and Des Moines, 7 miles South of I80 | Do you know if it is a C9 engine with the HEUI fuel system or is it a C9 engine with common rail fuel system? (Haven't worked with heavy equipment) Do you have a picture, of your engine, especially the left side(fuel system side)? = I might be able to point to location for you to check fuel pressure(install a pressure gauge) If it is a HEUI engine, then I suspect the fuel return check valve might be faulty(fuel pressure reading would tell us) = I assume it will be at the rear of the cylinder head.(see photo)
 (C9 engine_in paint program.jpg)
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 C9 engine_in paint program.jpg (73KB - 143 downloads)
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C9 Cat Fuel problem
