Fuel leak on diesel 211's

[glojo]

Just a simple poll.

Do you own a diesel powered E-class and have you experienced any type of fuel leak?

If you have, and it has been fixed, could you possibly explain where the leak occured?

Thank you very much indeed for participating,
John

 

[Brian WH]

Well you know I have John boy.

 

[RichardM]

I now have my second!

 

[glojo]

I now have my second!

HECK!!!!!

So we need to add one to the 'Yes' vote. Is the leak from the same place?

I note that folks are saying yes, but forgetting to add where the leak was located.

If you do know, is it possible to edit your posts so that we can be aware of where to look, and also I might consider writing to Mercedes-Benz UK. Far better to have a modified piece fitted before a leak occurs?

Thanks very much,
John

 

[RichardM]

HECK!!!!!

So we need to add one to the 'Yes' vote. Is the leak from the same place?

I note that folks are saying yes, but forgetting to add where the leak was located.

If you do know, is it possible to edit your posts so that we can be aware of where to look, and also I might consider writing to Mercedes-Benz UK. Far better to have a modified piece fitted before a leak occurs?

Thanks very much,
John

I don't know where the first one was John, as the dealer found it during the service but didn't have the part so I had to go back. The latest leak is the Leak Off pipe (last pipe). That's what he told me to tell the dealer anyway.

 

[Satch]

2 very small leaks, more seepage really, but diesel does stink. One from a high pressure coupling and another on low pressure supply pipe into pump.

Both fixed very quickly and no problems since but annoying.

 

[Abbs985uk]

diesel leak

had one on the high pressure pipe in the engine bay, dealer kept the car until part arrived, no leaks since, touch wood.

 

[marcos]

Yes lots

 

[Satch]

Well that is depressing.

Why on earth is it so difficult to fix this? I can understand that in technical terms things are going to be more difficult on the high pressure end but there seem to be a considerable number of leaks on the low pressure side.

After my last episode find I keep sniffing around the grill after turning off.
(Perhaps we should have a poll on that!: Do you sniff your engine?)

Now I suppose that the fuel/injection system must have a vent somewhere (perhaps with a charcoal cannister on the end?) so if would be nice to know what represents a "normal" level of diesel pong, if any at all, and where that would come from so I do not get into a flap again.

Pretty certain that for some time after I got it did not smell at all. Now, post two low pressure leak fixes, just a very, very faint whiff a few minutes after turning off that goes away after 30 minutes or so.

 

[glojo]

Well that is depressing.
Now I suppose that the fuel/injection system must have a vent somewhere (perhaps with a charcoal cannister on the end?) so if would be nice to know what represents a "normal" level of diesel pong, if any at all, and where that would come from so I do not get into a flap again.

Hi Satch,
I reckon we need Dieselman's expertise here because I have absolutely no knowledge of the technical side of these CDI engines.

The low pressure side though should return any fuel back usually to the fuel tank. There should definitelybe NO 'pong'. Indeed if mine had te faintest of 'whiffs' I would be more than a 'trifle' upset.

The car is parked inside our double garage and we have placed an old carpet on the floor. ANY leak would soon show itself!.

Any leak or smell no matter how slight is just unacceptable.

Regards,
John

 

[Dieselman]

There is no need for any vapour catchment filters on a diesel because it produces no vapours.

If you have a leak onto the engine it usually stinks because the heat is vapourising the oil.

In reality sorting diesel leaks is childs play but it's down to poor design that they happen in the first place. However 1600Bar / 23,200 psi is a pretty good pressure so any clearance and the oil will be through.

The risk of a fire is also minimal on a diesel as in normal circumstances it is very difficult to ignite.

 

[silverarrow]

reason for leak is o rings shrink ie not fuel resistant and pipes bcome brittle can not take the heat bad design a bit like the cdi injectors

 

[glojo]

reason for leak is o rings shrink ie not fuel resistant and pipes bcome brittle can not take the heat bad design a bit like the cdi injectors

If it is a poor design then you would expect all CDI engines to have this problem.

The result of this poll would bear out your theory, but on the other forum that I subscribe to, there has only been one other person complaining about a diesel like smell, but this has not been traced.

I am certainly NOT disagreeing with your observation, I fully accept what you say, I am just thinking aloud. 'Why don't all CDI engines have the same problem?' is my thought and I suppose polite follow up question?

Thanks,
John