PeachParts Mercedes-Benz Forum - E300TD diesel purge proceedure solved!

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Where is fuel pre filter located?

I'm poking around trying to change the main fule filter and I cant seem to see the pre-filter, where is it hiding? Thanks for any insight...

Pre-filter is on top left side of housing. its 8mm (maybe 10mm forgot) bolt holding it down.

Thanks. I see it now. For some reason I was expecting it to be out in the open...

fuel filter gaskets

I have a new main fuel filter from Mann that includeds 2 small gaskets. Can anyone tell me where they go. The bolt holding the filter to the housing looks like it has a gasket. Is this correct? What about the other one, it looks much smaller. Thanks again for any input.

Quote:

Originally Posted by mrmagoo12 (Post 3051722)

I dont think there is any gaskets for fuel filter housing.
The bolt holding the main fuel filter, that has 2 O-Rings.
Pre filter has a big O-Ring, usually those pre filters dont come with o-ring, you have to buy it separate.

I should have said O-rings not gaskets. Yes I received two small O-rings with the main filter from Mann. However the bolt I removed, holding the filter to the housing, only has one O-ring and its located close to the top of the bolt head. I think I see a spot, just above the threads, where a second O-ring could be placed. Does this sound correct. Thanks agin for your helpful insight Kinghais.

Quote:

Originally Posted by mrmagoo12 (Post 3052015)

. . . . . . . I think I see a spot, just above the threads, where a second O-ring could be placed. Does this sound correct. Thanks agin for your helpful insight Kinghais.

Yes that is correct. This pic should help.

Ok almost there...what is the best way to remove the small black cap like fitting, that sits on top of the prefilter housing. It looks like this cap connects to a clear plastic fuel line. I was able to remove the pre-filter from the housing while keeping it connected to this cap and fuel line. Figuring out how to remove the cap and install the new pre-filter seems tricky. Any further insight? Thanks a million.

Np, We all here to help eachother. I have changed pre filter few times and i just pull it off. Should b easy n dont forgot to have o ring on it first.

Just a little bit of elbow grease and a set of pliers and I was able to pull it out. Thanks again.

Followed lots advise here and got the car to start with persistant cranking and pre filling the main fuel filter.

Thank you crmont! I've been used to the ease of doing a purge on a W124. Your setup was actually easier and I happened to have the old fuel lines left over from a previous fuel line replacement. The one from the filter to the shut off happened to bend the right way.

I tried and failed horribly earlier today because I did not have the right sized hose to make the connections at the firewall. Lets just say it was a frustrating messy failure.

Purge done and quieter engine now.

Thanks.

Quote:

Originally Posted by Parrot of Doom (Post 1430117)

I wonder, whats wrong with pouring the stuff directly into the tank?

You could pour it in your petunias and it would help your car just as much.

Quote:

Originally Posted by winmutt (Post 1461760)

Question. Once you were done with the purge did the noises come back? I think I am going to buy a gallon of purge and run through the whole container.

For this price you could actually fix your car the way the factory manual says to.

Quote:

Originally Posted by TwitchKitty (Post 1372286)

The real cure for any Diesel Purge related problem is to avoid the product. I have posted the MSDS sheets and ingredients and the uses of the ingredients before. Don't waste your money. I posted about the attempts of standards organizations to set standards for this and similar products, they dropped the project. I have asked for anyone to post the name of any diesel engine manufacturer who recommends this product or any other like it. Don't waste you money.

If you have injection problems read the manuals by Mercedes or Bosch and fix the problems. Throwing money at the problem will not make it go away.

Another member here who is a Bosch authorized service center posted that Diesel Purge may actually damage your injection system.

It is a high profit item with little or no value for use in your car.

Stand by for anecdotal information to dismiss this post.

Still amused at the futile efforts to deny proper maintenance of diesel injection systems.

Well the product does work. I can attest first hand. It won't fix a broken injector but it sure can clear a fouled nozzle quite nicely. I have no evidence other than the movie I posted years ago. Since then I had white smoke when holding rpm at 2500. I did the purge and it completely cleared up the problem. It also fixed #2 glow plug! Jk it didn't do that.