Quote:
Originally Posted by rrgrassi
I am interested in the primary filter, and I do know it's the clear plastic one.
I started running B90 after diesel shot up to $3.09 and now the primary filter keeps clogging daily. I also have the Stanadyne FM100 w/the water/sediment bowl after the primary filter. There is brown gunk in the sediment bowl as well. I was thinking about putting the FM100 before the primary just to get more filter surface area, and I can dump and flush the sediment bowl instead of changing filters. The FM100 filters to 30 microns.
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It sounds like you are either getting bad fuel or your tank has algae growing in it. I think the Mercedes designers were well aware of the potential algae problem when they put three filters in the fuel system. The tank screen gets the big stuff, the primary the next and finally the screw on filter gets most of what's left. I don't know what ends up going through the pump and injectors. If you do have algae, the only cure is to yard the tank and have it cleaned and then treat the fuel with a chemical to kill the algae residue. I used a product called "BioGuard" from a marine supply store. Pulling the tank is not a tough job and it will give you a chance to check the fuel lines under the car. The tricky part is using the fuel down to the point where you only have a gallon or so to drain out.