The fuel filter is just behind the driver side door and on the outside of the frame rail. Easy to see.

 

Update on the engine shutter at startup. With 3/4 of a tank used, the BG44K has worked wonders. I have not experienced any shutter in the last few days. I doubt the oil & filter, gas line filter and air filter change had anything to do with. Even though it's pricey, I'll use BG44K again if the shutter returns.

 

good to go ...glad you got that beast running tip top