PeachParts Mercedes-Benz Forum - View Single Post

NCfriend · #5 09-03-2012, 12:01 PM

The first filter (2 pics) should have a rubber seal; it may be stuck on the bottom of the filter housing where it screws onto?! I have seen a couple get left attached due to heat.

second if the your MB stock secondary filter and good to change about every oil change. or Now if never done! Likely only running your original tank's diesel supply through it and should be clean enough between routine changes.

The fourth pic I have seen before, where someone improvises a "primary fuel filter" onto a vacuum line to replace a factory "vacuum dashpot" . I am not very knowledgeable about the vacuum systems, but answers are easy to obtain here.

The fifth is your MB factory "primary filter" and should be changed anytime the inside screen starts collecting alot of dark trash. It is the filter that will be the FIRST to clog! It protects the injection pump and gets first taste of all your fuels.
Carry a couple extra and a long handle screwdriver to reach the hose clamps. Be ready to change on side of the road (any of these actually!!

but be careful of the hot engine parts - coolant lines and metal block.

*Find a good explanation on changing fuel filters and priming the lines to print out and keep in the glovebox with a spare filter of each kind and all basic tools needed.
Most filter changes don't require the priming sequence.

That extra filter is your WVO filter, though it is a more generic one than I'd expect from greasecar. Perhaps just an addtional add-on by an owner?

We need a pic of that front corner backed-out some, where that fuel filter and likely the FPHE (flat-plate heat exchanger) is using the coolant lines (red tubing) to exchange heat to that veg fuel coming in.

Also: let's see the tank in the trunk.
Is there another filter set-up there?
Any heat source electric or coolant lines running back to that tank?

First impression: sounds like old clogged filters. May have to flush the veg lines.
Long-term: need more heat (ex: injector-line wraps mentioned by Zacharias)