1995 E300D fuel shut-off valve doesn't work - PeachParts Mercedes-Benz Forum

Jeremy5848 · #1 03-30-2012, 10:43 PM

The 1995 E300D (W124, OM606) has a one-year-only fuel shut-off valve located on the secondary fuel filter housing. On my new-to-me car this valve was missing, replaced by an ordinary bolt like previous and later models have. I bought a new valve and installed it with new o-rings but it does not work. I can screw the valve shut (it's very much like a water valve) and the plunger closes off the fuel path but the engine doesn't stop. Obviously the engine is continuing to get fuel somehow. I believe this problem has been discussed here before but I am unable to find any threads. Can anyone steer me in the right direction?

Jeremy

connerm · #2 03-31-2012, 07:26 AM

That valve just shuts down the fuel supply. It does not act like a stop lever like the 617s have. I never figured out how to shut down the 606 except with the key, and uh, by running out of fuel.

GregMN · #3 03-31-2012, 11:14 AM

Quote:

Originally Posted by Jeremy5848

I can screw the valve shut (it's very much like a water valve) and the plunger closes off the fuel path but the engine doesn't stop

If the plunger closed off the fuel then the engine would stop.

Turn it the other way.

Jeremy5848 · #4 03-31-2012, 11:43 AM

There is no "other way," Greg. Like a water valve, it's "lefty loosey, righty tighty."

Bio300TDTdriver · #5 03-31-2012, 12:11 PM

Is it possible that the residual fuel in the line is keeping it running? How long did you leave it screwed in to stop the engine? Did you try to rev it up to burn the fuel more quickly?

95m3ltw · #6 03-31-2012, 12:27 PM

Quote:

Originally Posted by Bio300TDTdriver

Is it possible that the residual fuel in the line is keeping it running? How long did you leave it screwed in to stop the engine? Did you try to rev it up to burn the fuel more quickly?

On my "new to me" 95 E300D, I closed the fuel cut off screw and let the car idle for 10 mins, revved it a bit and it did not stop. Killed the car with the key, went inside and then came out 10 mins later, drove to work 41 miles away with it closed! Parked at work and rode my bike home so the car sat at work over the weekend. 4 days later, it would not start and then I remembered the fuel cut off screw being closed, opened it and cranked on it a few tries and it started up. So either the screw valve leaks or doesnt make a complete seal to stop fuel flow. I know the car would not have made the 41 mile trip on the amount of fuel in the injection pump and filter. Given the cost of the bolt, it will be replaced with a non ball valve bolt and in the event I need to kill the car, will just remove the standard bolt/fuel filter.

Jeremy5848 · #7 03-31-2012, 12:41 PM

That's good information, thanks. In my tests, I let the engine idle for a good 5 or 10 minutes. Didn't try driving it, though.

It's also been discussed elsewhere that the 606 IP has a stop lever shaft but no lever. When the key switch is turned off and the engine stops, you can see this shaft turn, so it should be possible to retrofit a stop lever. You'd have to add a long push-rod to extend up through the intake pipes but at least there's be some way to stop the engine.

Bio300TDTdriver · #8 03-31-2012, 01:19 PM

Quote:

Originally Posted by 95m3ltw

On my "new to me" 95 E300D, I closed the fuel cut off screw and let the car idle for 10 mins, revved it a bit and it did not stop. Killed the car with the key, went inside and then came out 10 mins later, drove to work 41 miles away with it closed! Parked at work and rode my bike home so the car sat at work over the weekend. 4 days later, it would not start and then I remembered the fuel cut off screw being closed, opened it and cranked on it a few tries and it started up. So either the screw valve leaks or doesnt make a complete seal to stop fuel flow. I know the car would not have made the 41 mile trip on the amount of fuel in the injection pump and filter. Given the cost of the bolt, it will be replaced with a non ball valve bolt and in the event I need to kill the car, will just remove the standard bolt/fuel filter.

Why not replace it with a ball valve and 86 the screw valve? I think I'm going to add one to my car.

95m3ltw · #9 03-31-2012, 01:43 PM

Quote:

Originally Posted by Bio300TDTdriver

Why not replace it with a ball valve and 86 the screw valve? I think I'm going to add one to my car.

Any info on the ball valve? I've thought about getting a valve from McMaster and putting it inline on the fuel hose.

Bio300TDTdriver · #10 04-02-2012, 07:16 AM

I just did a Google search for 5/16" fuel line ball valve. The picture came from an EBay listing. There is one here.

Jeremy5848 · #11 04-02-2012, 11:35 AM

On the 606, where would you put a valve? All of the fuel lines are pretty much buried beneath the intake manifold.

Jeremy

Bio300TDTdriver · #12 04-02-2012, 11:41 AM

Quote:

Originally Posted by Jeremy5848

On the 606, where would you put a valve? All of the fuel lines are pretty much buried beneath the intake manifold.

Jeremy

Don't they peak out from behind it where they hook to the filter? Is the filter in the same location as on the OM603?

digman11 · #13 09-28-2012, 03:51 PM

hey there, I recently got a 1995 E300D and have had some issues with it (crank-case filling with fuel) and after one episode of 'runaway diesel', I didn't get a shut down. The shut-off valve handle on top of the fuel filter is gone, but, the screw stem is in tact, so, with a pair of pliers, I have shut down the engine that way twice now. Have you tried manual shut off both with and without the key in the ignition? Is it possible that leaving the key in the ignition is working against shutoff? The other thing is that when you installed it, I wonder if somehow the screw that shuts off the fuel in the filter just isn't getting down far enough. I'm pretty novice, so, these are my observations, based upon my own situation. Hope this leads to a problem solve though, because if you ever have fuel in the crankcase, you'll definitely want to shut down if the Vac pump goes bad!

sixto · #14 09-28-2012, 04:15 PM

Jeremy has since rigged a mechanical STOP lever directly into the IP like in the 603. Not possible in a 210 though.

Sixto
87 300D

Jeremy5848 · #15 09-29-2012, 12:57 AM

Quote:

Originally Posted by digman11

hey there, I recently got a 1995 E300D and have had some issues with it (crank-case filling with fuel) and after one episode of 'runaway diesel', I didn't get a shut down. The shut-off valve handle on top of the fuel filter is gone, but, the screw stem is in tact, so, with a pair of pliers, I have shut down the engine that way twice now. Have you tried manual shut off both with and without the key in the ignition? Is it possible that leaving the key in the ignition is working against shutoff? The other thing is that when you installed it, I wonder if somehow the screw that shuts off the fuel in the filter just isn't getting down far enough. I'm pretty novice, so, these are my observations, based upon my own situation. Hope this leads to a problem solve though, because if you ever have fuel in the crankcase, you'll definitely want to shut down if the Vac pump goes bad!

Your 'runaway' situation I have fortunately never encountered. All of my stop-valve tests were made with the engine running (obviously) and the key ON. I never considered that the point of the STOP valve was to stop the engine when you have turned off the key but the engine didn't shut off. Interesting! and thanks for the idea. It's too late for me to repeat the test as I no longer have a stop valve and, as Sixto wrote, have a stop lever designed after the one on the OM603 engine.

Jeremy