For my first Instructable, I'll document the steps I took to install a secondary fuel filter in my 1983 Mercedes 240d. Currently I'm running a mixture of WVO and biodiesel. My fear is that I'll be on the road and have to do roadside maintenance because of a clogged filter- now I don't have that problem.

*Please note- if you try this, you do so at you own (and car's) risk.

Step 1: Tools and Materials

razor blade, or knife
protective gloves
something to catch the fuel that spills


Fuel filter- I used a Mann WK 842/3
***3/16" fuel line 4-5 ft***
In line fuel shut-off switch
(x2) 3/16 T-connections
zip ties


Hose clamps
-small: enough for all hose connections
-Large: To attach to optional mounting bracket
custom mounting bracket (not discussed in this instructable)

***If you're running WVO or biodiesel, you will want to get synthetic lins such as Viton or A1 grade Marine fuel line.***
Dude! I have that same car!
Very Important. The filter in the parts list is a WK842/2 but the filter in the photograph is a WK842/3. They are rather different. You want a WK842/3 NOT a WK842/2
Ronorr, Thanks- I've changed it to the correct filter.
alex: Yes, unless it is clogged then the fuel will go through the origional. Linux- correct alex- senthetic lines are the way to go- but I'm under the hood enough to watch 'em. Plus, this will work for regular diesel as well. gog- I mention that as optional. The fuel is under low pressure and they were not orignally, so again- I'll keep an eye out. BTW, I keep a couple of feet of fuel line along with a lot of tools in the trunk- just in case. Thanks for the comments!
also,diesels feed fuel via gravity
I've added the synthetic line info and use of hose clamps to the parts/tools step. I guess that I should have been more clear. Thanks.
That's cool, but wouldn't fuel still flow through the secondary filter even if the switch is "on"? Yay biodeisel, just filter the fuel BEFORE putting it in your tank
I think they use the 2nd one and have the original as a backup
oh, now i see the creator should change his fuel lines to synthetic ones, Biodiesel (the home-made type) will eat away at your tubes until nothing else is left!
I'd recommend some hose clamps on those fuel lines so they cant pop off.

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