Stevemillermd

My daughter's 2014 GLK 350 4matic has developed a fuel leak on the driver's side fuel filter. I cleaned it up and started the car and it appears to be leaking around the nipple where the blue fuel line goes on. I don't see any cracks in the plastic housing and was I was wondering how hard it is to change the blue fuel line? I can't find the other end of the hose. I don't want to go through the trouble and expense of replacing the filter only to find out that the hose was the problem.

Stevemillermd

Forgot to say thanks!

calder-cay

In my mind, "appears to be leaking" isn't a definitive conclusion.

If you wrote, "it's no doubt leaking ...", then it's obvious of the problem.

Unfortunately, I can't provide a list of "check this and check that".
I will state there are a number posts out here of folks complaining of a "fuel odor", which might help (three links to threads):

https://mbworld.org/forums/glk-class...l-no-leak.html

https://mbworld.org/forums/glk-class...ling-tank.html

https://mbworld.org/forums/glk-class...-over-car.html


I post those because some have photos similar to what you provided. If I remember correctly, it's a gasket leak for the plate.

(keep in mind, I've been retired for over three years and my mind is mush, so the above might be rwong 👍 ).

Stevemillermd

Sorry I should have put it's definitely leaking where the hose goes onto the nipple, I could see it coming from there, and even though the hose clicks on it is loose and wiggles a bit. I did not see an O-ring inside of the hose end. I will have a look at those posts though, thanks

habbyguy

I'm chasing a similar problem but my 2011 is obviously different from your 2014 (no blue hose - or any hose - on my driver's side fuel tank "cap"). In my case, the leak is on the right (passenger's) side cap, and I'm starting to believe that the problem is that the leak is coming through the plug (indicating a leak in the cap "electrical feedthrough") but I'm taking it a step at a time and (big shock...) video-documenting the process.

Anyway, in the end, what you have is "just a loose hose" - I'd check to see if it's possible that your year GLK is supposed to have some sort of quick disconnect or clamp on that line. If not, it seems like a fairly trivial matter to come up with a workable and robust solution to clamping that hose onto the nipple to keep it from leaking. This assumes that the pressure is reasonably low (I believe that the low pressure fuel pump in the tank produces 40-50 psi). That's well under my house plumbing pressure, so it's not a super-tough job to make a secure connection. A MB online parts diagram might show if there are any clamps or other devices to contain that pressure / secure the hose.

Stevemillermd

It has a green button that you can see in the picture around 6 o'clock, that clicks when it is pushed on but it's still looser than I would expect, and that is where the gas is coming from. I will check a diagram as you suggest though, just to make sure, or maybe I can add something there but it's a hard plastic piece so I don't know. Thanks for the suggestion and good luck with your leak.