I have the same chassis but with a Cat C-7 engine. I hav e two fuel filters, one at the rear of the coach, Wix 33434. Easy access. Also have a second filter that high on the side of the engine near the injector pump, Wix 33626. This one is much harder to access. I have to remove the access panel under the bed to even see it. Iím able to reach it from this point but sure isnít easy. Both are screw on filters.
2006 Gulf Stream Friendship G7
350 Cat, Crusier Lift w/ Honda VTX
Blue Ox and 2019 Chevy Blazer RS AWD V6