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  #1  
Old 10-01-2020, 09:49 PM
Registered Hack
 
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OM606 W210 - No fuel to engine

Little stumped and surprised here. I only have manuals for W124, as well... so perhaps I am missing something.


Trying to get a W210 to start after sitting for a few years. I have taken care of everything else... just assume for now that the only thing left is that I am trying to get fuel to the injectors.


New fuel in tank


Replaced many of the orings on the fuel supply system, specifically on the suction side before the lift pump.


When I pull the fuel hose that comes from the firewall leading to the the fuel heater, I can hold a vacuum there for a long time and no fuel comes through.


maybe a drop. If I wait overnight and pull a vacuum again, I get more... but it stops flowing.


When the tank was empty... I could not hold a vacuum doing a similar procedure.


W.T.F!?


Is there a valve between the tank and the engine on aW210?

EDIT:
I am getting fuel to flow when pulling a vacuum of 20-25 in-hg. That seems excessive.

Anyone know what a typical suction pressure on a w124, w210 or OM606 is to get fuel to flow from their tank?

I would think under 10 in-hg should be sufficient on a low tank.

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Last edited by jt20; 10-02-2020 at 05:39 PM. Reason: new data
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  #2  
Old 10-02-2020, 03:42 PM
engatwork's Avatar
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You should be able to disconnect it and get fuel out. Are you sure lines are not reversed?
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  #3  
Old 10-02-2020, 05:40 PM
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Not reversed that I can tell. Original clamps at the firewall and the 2 hoses are very different.

I was able to get fuel to flow... but it requires a really high vacuum and doesnt flow very fast.
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Old 10-02-2020, 05:46 PM
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At this point, I am going to assume the strainer is clogged.

Is it true that the tank has to be removed on this model, to pull the strainer?

W210 1997 E300d
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  #5  
Old 10-03-2020, 02:47 AM
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Try removing the Fuel Fill cap and see if that makes it easier to get fuel up front.

My older car has a tank vent system that can get plugged. Removing the Fuel Fill Cap would act as a tank vent; at least for testing.

When I have had to bring fuel up to the front after my Volvo Diesel sat a year I used one of the Electric Fuel Pumps that I already had.
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Old 10-03-2020, 06:27 PM
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Try blowing compressed air back thru supply line with fuel cap off. Have someone listen for venting at tank end. That should clear strainer some.
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Old 10-06-2020, 12:19 AM
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Did you take off the shut-off box, and change the o-ring on the back side of the shutoff box?

I bet that is your issue.

Usually people get all the leaks tracked down, but miss that one.
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  #8  
Old 10-06-2020, 11:05 AM
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The 606 is notorious for being hard to prime after replacing all the fuel system components.

Double check you have a good o-ring at the pre filter (the little ‘coffee maker’ basket on top of the filter stand).

Go easy on the starter they can get burnt out from over use.

If air has gotten into the injector lines, you will have to loosen the nuts at the injectors to purge out the air. Otherwise the pressure pulses from the injector pump will just compress the air in the hard line like a sponge and won’t let the pintle valve open at the injector nozzle.

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