350gunner

My 2014 GL350 gave me a a "Check Fuel Filter" message in the middle of a 2,000 mile drive. The warning popped up in heavy rain, and it did clear the next morning. I think I did feel some power loss for a short while but that also resolved.

I was under the impression my filter was changed when I took the vehicle in for the emissions recall/service, which was not that long ago. It should not have gone bad yet.

Does the warning now mean I need to change the fuel filter? It looks like a half day's labor for me, and some serious risk of breaking old plastic parts that need to be moved for the job. Or instead of replacing it will a couple of treatments of Howe's diesel treat be enough to keep me going?

Also if anyone can access the step-by-step instructions for the procedure, I would be very grateful. The VIN is 4JGDF2EE8EA322575.

Quint22

Looks like a good write up. Much different then my om651 but pretty much same filter, just all the crap ya gotta move to get to it.

https://mbworld.org/forums/gl-class-...42-3-0-v6.html

rapidoxidation

Pouring a fuel system cleaner into your fuel system will not clean the filter.
That said, I've been using 4-10 ounces of the grey bottle Power Service on just about every fill up on all my diesels since about 2001 and have yet to have a fuel related issue with the exception of when I didn't use the additive and the temps got well below -20F - my truck's fuel filter gelled up and had to be replaced. One issue, due to not using the additive. Regular filter changes (every 25K or so?) is not a bad idea.

350gunner

Thanks for posting that, I searched the archives but missed that.

I'm going to have to change the filter, so be it. Do I need new O-rings and seals for the MAF/turbo pipe/other stuff that comes off in the process?