Installing a Secondary Fuel Filter (diesel)

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

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

Materials:

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

Optional:

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.***

Comments

[Monkeyboy13]

Dude! I have that same car!

[ronorr]

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

[skree]

Ronorr, Thanks- I've changed it to the correct filter.

[skree]

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!

[Derin]

also,diesels feed fuel via gravity

[skree]

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.

[alex-sharetskiy]

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

[LinuxH4x0r]

I think they use the 2nd one and have the original as a backup

[alex-sharetskiy]

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!

[gog]

I'd recommend some hose clamps on those fuel lines so they cant pop off.