Go Back   MBClub UK - Bringing together Mercedes Enthusiasts > Technical > Engine
MBClub supports BEN Official Stickers @mbclubuk


Engine Engine/transmission and other oily matters

Reply
 
Thread Tools
Old 21-08-2012, 09:11 PM   #1
Hardcore MB Enthusiast
 
Join Date: Apr 2004
Posts: 102
w124 om606 air in fuel lines

As the title suggests, there is air in the fuel lines of my om606-equipped w124 (E300 Diesel T-Model, 124.191). I have researched this as much as I can and just need a few pointers. I can see bubbles in all of the clear plastic tubes, including the tube that leads from the fuel heat exchanger to the fuel pre-filter. Am I right in concluding that the air leak must be upstream of the fuel pre-filter? If so, am I right in concluding that the air leak must be either at the fuel heat exchanger or at the tank strainer or at some pipe join in between? There is no diesel on my driveway. Surely if the leak anywhere else, I would not be seeing air bubbles in the clear pipe which goes from the fuel heat exchanger to the fuel pre-filter? The bubbles appear to be travelling with the fuel (obviously, I suppose). Thanks for your help.
jjrodger is offline   Reply With Quote
Old 22-08-2012, 01:35 PM   #2
Hardcore MB Enthusiast
 
SilverSaloon's Avatar
 
Join Date: Mar 2004
Car: 1994 W124 E300D Estate, 1985 R107 280SL
Posts: 7,625
yes there will be one or more leaks before the heat exchanger.

A few things to note from my own experience of these:

- main black rubber fuel pipe in engine bay going to HE can go brittle at the ends. worth replacing

- main black rubber fuel pipe at tank end (from tank to metal pipe that runs under car) also worth replacing for same reason.

- in-tank strainer blocked. If this is blocked basically the car finds it easier to suck air than fuel hence bubbles. The tank strainer can be removed and cleaned (its just mesh)

- the HE can also leak air if its not torqued down to the head properly. There is a large green rubber gasket inside. i removed mine, cleaned it up, smeared some silicon sealant on it and refitted. Nice and tight now.

Of course, also replace all those clear pipe orings:

MERCEDES E300,E250,C250 VITON FUEL O-RING KIT SVO,WVO,BIO-DIESEL,210,124,202,C,E | eBay
__________________
Mercedes E300D Multivalve W124 Estate (1994) - MB-Tex, Electric Seats, Wood/Leather wheel, Alloys, Orthopedic Seat, Auto-Dim Mirror, Auto Climate, Cruise Control
Mercedes 280SL R107 (1985) - Signal Red, Pebble Leather, Cruise, Rear Seats, Headlamp Wash/Wipe, Alloys
Mercedes E300D Multivate W124 Estate (1994) - Grey cloth, zebrano wood, air-con
1997 CLK 200
Rover SD1 Vitesse - 4.0 V8
Austin Mini Van - 1962 - 850cc


SilverSaloon is offline   Reply With Quote
Sponsored Links
Old 22-08-2012, 01:46 PM   #3
Hardcore MB Enthusiast
Threadstarter
 
Join Date: Apr 2004
Posts: 102
Thanks you for this. The 'O' rings and clear plastic pipes have all been done recently. It sounds like it is upstream I need to concentrate on, the tank strainer, the pipe to the heat exchanger and the heat exchanger itself. Thanks again.
jjrodger is offline   Reply With Quote
Old 22-08-2012, 06:26 PM   #4
Hardcore MB Enthusiast
 
SilverSaloon's Avatar
 
Join Date: Mar 2004
Car: 1994 W124 E300D Estate, 1985 R107 280SL
Posts: 7,625
in that case check the tank strainer 1st as its easiest:

HOW-TO: Replacing fuel tank strainer in W124/W210 estate (Diesel)
SilverSaloon is offline   Reply With Quote
Reply

Tags
air, fuel, lines, om606, w124


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools



All times are GMT +1. The time now is 07:43 AM.


MB club UK is A Mercedes Enthusiast club run by enthusiasts for enthusiasts, MBClub UK is in no way affiliated with Mercedes-Benz, DaimlerChrysler or any of their respective trademarks. The posted views of our members are in no way the views of MBClub.co.uk or its owners.
Find us on Google+