Originally Posted by Booyah45828
I only see 2 filters in your pictures. The first and second picture show the same filter, which is the one with the black handled thing on the bottom, and is your fuel filter/water separator. And judging by the rust on it, it should be replaced.
The second filter behind it, would be nothing more then a guess as to what it is without a part number. It could be fuel filter as well, or a transmission filter, or something else entirely. Where the lines from it run to will determine the fluid it is filtering.
Do you have a picture of the 3rd filter?
OK, that gets me going down the right track at least. I had a feeling they were filters for discrete parts, but a cabover bus definitely has these things in kind of diverse locations, so I wasn't sure why they were so far back from the engine compartment.
I'll get better pics of all three later today. The third one is further back from the battery box, these two are to the front of the battery box.