i am sure its canister one on the new sprinter,,if it is it will have a pipe in and a pipe out and a double pipe thats twists in place and held in place with two torx screws,,, if it has you could try filling the filter first before fitting using fuel out of a can or buy a hand primer pump and suck the fuel through the filter via the pipe coming out of the filter, or connect the filter up and turn the ignition on and wait 10 seconds or so before starting and this will self prime if the vehicle is fitted with a electronic lift pump in the tank, i hope this is of some help
garthy, November 2007