Mercedes Diesel OM642 3.0 V6 Engine - Common FUEL LEAK Areas

Where to CHECK on the OM642 Mercedes Diesel Engine for Fuel leaks. In this video, I will show the most likely areas on your OM642 engine to be the cause of a diesel fuel leak. Although this video features the OM642 engine, the areas to check will be common across many other Mercedes diesel engines and look very similar.

Are you experiencing a Diesel smell in car )which can easily be confused with exhaust smell in car)? or maybe you have noticed exhaust fumes in car, especially coming through the heater vents when you pull up to a stop sign or traffic lights, then chances are that you have a diesel leak on your Mercedes diesel engine.

These fuel vapors can make you smell exhaust in car, when it is actually a fuel smell in car. It’s very easy to confuse the two depending on how sensitive you nose is!

Mercedes Benz Diesel OM642 Engine Fuel leak. In this video, I will show how to inspect 3 of the most likely sources of a diesel leak and hence, a diesel smell on the Mercedes OM642 diesel engine.

- SUPPORT -
If you like my work and want to help to support this channel you can use the link below and buy me a coffee. Thanks!

Or maybe give me a THUMBS UP! 👍 👍 👍

You can also find me on Facebook at:

So, in this Mercedes OM642 video, I will show you how to inspect the 3 most likely areas to cause a diesel smell in car on your Mercedes Benz Diesel:

👉 Leaking Diesel fuel filter and / or fuel lines is a very common cause of fuel smell in car and remember, it can seem like exhaust smell in car, the two smells are very similar on a Diesel car

👉 Leaking high pressure fuel pump. The Mercedes OM642 engine is very reliable but it isn’t uncommon for the fuel pump to start to leak on older cars and cause an exhaust fumes in car type of smell

👉 Leaking fuel injector connections / leak off pipe O rings – Similar to the diesel fuel filter above this is a key are to check for a diesel leak

The following Mercedes diesel vehicles should be covered by this Fuel leak Diesel smell in car video:

Mercedes-Benz Sprinter van (2006–Present)
Jeep Grand Cherokee WK/WH (2005-2010 (Europe)
Jeep Commander XK/XH (2006-2010 (Europe)
Mercedes-Benz C320 CDI (2005–2009)
Mercedes-Benz E280 & E320 CDI/Bluetec (2007-2009)
Mercedes-Benz C350 CDI (2009–2014)
Mercedes-Benz CLK320 CDI (2005-2010)
Mercedes-Benz E350 CDI/Bluetec (2010–Present)
Mercedes-Benz G350 CDI/Bluetec (2007–Present)
Mercedes-Benz GLK 350 CDI (2013–2015)
Mercedes-Benz R320/350 CDI/Bluetec (2007–Present)
Mercedes-Benz ML320/350 CDI/Bluetec (2007–Present)
Mercedes-Benz GL320/350 CDI/Bluetec (2006–2012)
Mercedes-Benz GLC 350 d (2016-present)
Mercedes-Benz S320/350 CDI/Bluetec (2005–Present)
Mercedes-Benz CLS320/350 CDI/Bluetec (2005–2018)
Chrysler 300C (2006-2011) (Europe and Australia only)
Mercedes-Benz Vito Van 120 cdi and Vito 204 Sports (2006–Present UK)
Mercedes-Benz GLC 350 D (2017–Present EU)
Mercedes W203 C class
Mercedes C209 CLK
Mercedes S211 S class

In the case of a leaking fuel injector, it has a fuel supply pipe and a fuel return hose. In the past, I have had to tighten the fuel supply connection a little bit to fix a diesel leak, so this is a good area to check. I have also found worn return line connection O rings, also known as leak off pipe O rings and had to replace them.

AND Spoiler alert – The leak on my car was on the diesel fuel filter, so I will show you how I fixed it on my diesel engine

The Mercedes Benz diesel that features in this Diesel smell in car Diesel leak video is a Mercedes Diesel CLK 302cdi, which has the Mercedes OM642 engine fitted. If this video helped you fix your fuel leak and get rid of your fuel smell in car problem.

PLEASE consider sharing the video, here is the link:
Mercedes Diesel Engine OM642 3.0 V6 Engine - Common FUEL LEAK Areas

Did it seem like an exhaust smell in car to you?
Where did you find the problem? Was it the diesel fuel filter, a leaking fuel injector or was it some other problem on your Mercedes diesel engine?
PLEASE Let me know in the COMMENTS!

#revivemyride, #MercedesOM642, #MercedesDeisel

DISCLAIMER Please note that this video and its content is intended for information purposes only. Although every effort is made to ensure that all the information is correct, there is no guarantee that this is the case. This video should not be considered a substitute for seeking independent advice or the services of a professional. Any work that you carry out on your vehicle or vehicles in your care are at your own risk.

[nedi]

Thanks man! You saved my trip. I found out that the hole in the filter was leaking fuel right before taking off. I'm not a knowledgeable person in cars but your instructions are very straightforward. Thanks to your video I was able to fix the problem in no time. Keep up the great work!

[orionsbelt]

One of the best instructional videos I've ever seen on Youtube! You did a fantastic job of explaining everything. This was my first time to see your channel and I definitely subscribed and gave you a thumbs up! Thanks again for taking the time to make these videos. I really dont know if you and others that make them realize how many people you help by doing so. It is greatly appreciated. Take care...

[norfolkbushmanandfriends]

mate your video has helped me no end, i knew i had a leak but didn't know where from. mine is the other hose next to yours, i'll be doing exactly the same fix. Thanks buddy, you're a life save, give yourself a good pat on the back for helping other people 👍👍👍🍻🍻🍻

[Camo]

LEGEND, after replacing glow plugs and the gp relay i was at my wits end to my slow start issue could be. I did notice the filter is wet so reckon this will be it. Great video, thank you.

[rckeeft]

I have the OM642 and was considering doing a fuel filter change. Thanks.

[PedroMiguel-mkus]

Oil cooler leak from the seals is also a common leak on this engines

[Tryingmybestsince]

Oh yes this video helped me! I didn’t know how to detach those clamps an i was afraid of working on the fuel filter, but seeing how easy and reusable are those clamps I will be changing them for sure!!

[angrycatowner]

There is also a set of low pressure lines running from the fuel return back to the fuel tank. It's behind the engine.

[ukaszjurys]

Another leak you may find where you have connection on the turbo.Oil drip into plug/socket for Swirl Flap Motor which is near fuel filter.Then only 4.7kOhm resister will help to sort limp mode :)

[uchennasabinus]

Hello friend i love your video very educative my ml350 ia not starting and when i checked up the fuel line diesel was not coming out is there a way to test the pump if its not working becuase my scanner is telling me very low fuel pressure in fuel rail

[dabay]

Great video. Can you tell me where I can buy those specific replacement fuel hose clamps - can't see them anywhere on ebay or amazon?

[mattszurko]

Just had my high pressure replaced and the low pressure hose and also, the injector hard line torqued down on injector 2… all that solved mine 😂

[rubendariofg]

Hi Phil, thanks for your videos.
I don't speak English so I don't understand your explanations. I try to read the subtitles. ..
I have a Mercedes R with an OM642 engine and for a year it starts badly when it has been stopped for a few days or when it is cold. The glow plugs are new, battery is ok and starter motor ok, injectors are ok.
However, after starting up if I wait 5 or 8 seconds it starts up perfect.
I have the feeling that air is entering the diesel circuit and the tube is being discharged while it is stopped. Once started, turn it off and it starts again the first time all day.
What seals would you change or review?
Thank you

[adilsonribeirodossantos]

Hello comeinhandy,
good afternoon
Help me in this situation please.

I have a jeep grandCherokee 2009 crd 3.0 limited after driving 30km shows failure in the fuel sensor past failure P2264 Fuel/water separator sensor circuit.
I have already changed the sensor and filters and the obd always shows the same fault as before.
could you give me some guidance?
it makes me crazy

[madeinthehell]

hello friend, it loses me at the top of an injector for the connection of the return line. the small joint that you say where it goes?

[arnietwo]

Checking a few vids re the V6 service and it appears a bit more involved than the 220, even changing the air filters seems to be complicated !

[thecynicalafro]

Please help. Could this be the reason for my white smoke and 2020-1 code (low fuel rail pressure)? 2006 ML320. Mechanic says injectors are fine. Changed intake and pcv valve seals

[irrggmr]

I think that with a non-return valve located between the tank and the diesel filter the problem of the circuit being emptied should be solved.
Does the Mercedes R with the OM642 engine have any original non-return valve? Where? I don’t know.
Thanks Phil.

[Smudger]

I have 2 small leaks from hoses. One on the filter next you your leaking hose which fixed and one on the hose going to the high pressure pump. I’ve not yet fixed this one. Will these leaks be a possible cause for poor performance (juddering at low revs)

[retractablehybrid]

I have a really odd diesel leak coming from the back of the engine... I can't find the source and neither could my local mechanic.. fuel lines all fine, injectors and return lines seem fine, fuel filter fine... I'm out of ideas.