* You know by now that you need to crimp the hose (outlet) from the tank which feeds into the fuel pump. If you're planning to replace this hose too, then just take the hose off the pump and drain the tank into a clean pan. If it's an option, it helps if you wait until the tank is nearly empty before doing the job.
* Since you plan to replace more than just a filter, it might be easier to remove the carrier that holds everything in the car, and then do the job on the bench. Rubber buffers (mounts) w/ 5mm nuts hold the carrier in the car. It can save time to have a reference picture (or a quick photo or two) of the whole assembly, on the bench, before you take it apart.
* All the hardware is available at most Lowes. I like to replace the 5mm philips machine screws with 5mm hex bolts (same thread pitch). Will make subsequent filter replacement easier.
* You probably know that you'll need to counterhold all couplings; i.e., use one wrench to hold, and another wrench to tighten. What you're planning to do isn't particularly complicated, yet there are a variety of ways to break things or leave leaks.

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ASE Master Tech
Quality Enterprises
Mercedes Svc. & Restoration
Sheridan, IN
317.769.3536