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I have traced my fuel leak to under the driver side rear seat. I searched the internet and learned this a common issue known to MB. (Why haven't they yet fixed it?) I spoke to my dealer and they indicated that it is very likely the O-Ring. So, I bought an O-ring. It wasn't causing the leak. The leak is coming from the blue line black coupling where it connects to the white plastic widget (fuel sending unit(?)). As I stopped the repair to come inside the house and investigate - the black fitting at the white plastic widget leaked fuel in front of my eyes. I know these parts commonly crack but there does not appear to be any cracks.
Also, every video I have seen addressing this issue has bolts connecting the circular metal keeper - mine does not. It appears for me to remove the circular metal keeper I need a specialty tool.
I have a few questions for anyone that has been here and done that. (1) How do I safely remove the black coupling?; (2) how do I safely remove the circular metal keeper that secures the white metal part?; (3) what is the white plastic piece (I believe it is the fuel sending unit but, am not positive). This is exactly where I saw the leak.
Any advice and help would be deeply appreciated.
Last edited by drhubbard; Sep 18, 2022 at 02:51 PM.
That fitting ( quick coupler ) uses o-ring as seal. there is a small push button at the bottom of the fitting, use torch and inspect slowly.
U need to change the blue hose.
Full 101 is below. BECAREFUL, pump can prime (activate) anytime, disconnect battery when doing fuel filter. Also replaced it if its is already that old or exceeding 50K miles https://mbworld.org/forums/e-class-w...er-change.html
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MB Fuel Leak Behind Driver Side
