hello i was just changing the inline filter on my 93 300d 2.5 turbo, when i took the old filter loose and put the new one on it started leaking were the fuel line goes into a plastic looking elbow.... what is this elbow ? i think maybe it holds the fuel thermostat ? it is loose ,moves like a 1/4 inch back and forth fuel is coming out around this piece, can it be tightened ? or is it broken ? what is this part called ? thanks in advanced, any help would be appreciated ... i am a noob with mercedes

Can you identify the part by number in the attached images?

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i think its were that #14 line runs into that #20 part if i am looking at it correctly ...? it looks like a plastic piece seated in a cast part , it is right above the motor mount... there is about 4 inches of rubber line after the inline filter that goes into this part ...it is the supply line

bump for any advice as to the name of this part ?

If you are talking about the end cover of the thermostat, it is part number 6010780016. This is the part that has the fuel line elbow. I am not sure though that it is a serviceable item that can be changed on the bench but it does have a snap ring to hold it in place. Order a new seal as well (o-ring). Part number 0119973948. Careful when you remove the lock ring as there is a spring inside that will want to push the cover out away from the body of the thermostat.

Best of luck.

thank you very much you sir are a life saver ...! do you know if the sell the whole thermostat housing and all ? and once again thank you

Well, the thermostat itself is only about twenty bucks. I'm sure you could purchase the entire housing assembly but it would be pointless unless somehow what you've got is damaged beyond repair. If the end cap and o-ring are leaking, start with that - replacing the thermostat if you really chose to while you're into it. My guess is that the solution is in a new o-ring and end cap (if the elbow on the end cap has a small crack perhaps...)

got ya ... i went back out and looked at it with a good flash light and believe it is the gasket maybe a victim of new ulsd ... once again thank you for your time

You bet. Good luck!