2002 Chevrolet Silverado 2500 HD Q&A

2002 Chevrolet Silverado 2500 HD Question: The past 2 weeks my truck has been getting very poor gas mileage.

It smells like it is running rich. Could it be the fuel pressure regulator. I've changed plugs and wires. not sure which way to go from here. -
Answer 1
Have it scanned with a real scanner, not a code reader and fuel system pressure checked. -
Answer 2
you might want to get a mech opinion if your not equipped to handle suggested tests -
Comment 1
'HAVE' it scanned! -