No start after filter replacement fuel distributor - Page 3 - Mercedes-Benz Forum
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post #21 of 186 (permalink) Old 06-22-2018, 10:56 AM
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The air flow plate moves when starting and it moves deeper when throttle is further open.
Okay … next on the to-do list: the fuel pressure test as described in my last post.

I wouldn‘t have noticed your last two posts if I wouldn‘t have visited this forum again. I didn‘t receive email notifications about them … happens often …

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post #22 of 186 (permalink) Old 07-01-2018, 06:28 AM Thread Starter
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Finally found time to test both fuel pressures. I first did the top chamber, see as well first movie, fuel pressure is 6 bar = 87 psi.

I checked as well if the system holds pressure for a longer time and this is the case, 3 bar for more then 20 min.

In the 2nd movie you see the lower chamber pressure is 5,2 bar = 75 psi. A difference of 0,6 bar or 12, psi.

Does this point us in a direction?

https://www.youtube.com/watch?v=VaII...&frags=pl%2Cwn

https://www.youtube.com/watch?v=88MD...&frags=pl%2Cwn
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post #23 of 186 (permalink) Old 07-01-2018, 10:22 AM
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... I first did the top chamber, see as well first movie, fuel pressure is 6 bar = 87 psi.
I checked as well if the system holds pressure for a longer time and this is the case, 3 bar for more then 20 min. ...
If that‘s what you measured at the CSV port, it‘s the system pressure (SP), which on your car should be between 6.2 and 6.4 bar. It should drop to 3.4 bar when the fuel pumps stop running. What I see in the first video points to a problem either with the pressure gauge or with the fuel pressure regulator.

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... In the 2nd movie you see the lower chamber pressure is 5,2 bar = 75 psi. A difference of 0,6 bar ...
That‘s during cranking. But (in post 18) I suggested to check LCP “with ignition off and fuel pumps running“.

You can alternatively check LCP during cranking, but with the EHA plug pulled off !
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post #24 of 186 (permalink) Old 07-01-2018, 01:42 PM Thread Starter
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Originally Posted by H.D. View Post
If that‘s what you measured at the CSV port, it‘s the system pressure (SP), which on your car should be between 6.2 and 6.4 bar. It should drop to 3.4 bar when the fuel pumps stop running. What I see in the first video points to a problem either with the pressure gauge or with the fuel pressure regulator.
Correct at the first movie the pressure is measured at the CSV port. I have a spare fuel pressure regulator once taken from the scrapyard so no history or certainly it's good, but an easy try to see if there is any difference.

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That‘s during cranking. But (in post 18) I suggested to check LCP “with ignition off and fuel pumps running“.

You can alternatively check LCP during cranking, but with the EHA plug pulled off !
Sorry, I am learning, overlooked the ignition off part. I'll try alternatively during cranking with EHA unplugged and revert back here to the forum asap.

Many thanks until so far!!
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post #25 of 186 (permalink) Old 07-02-2018, 02:40 PM Thread Starter
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Tested again the system pressure and lower chamber pressure, but this time with EHA unplugged.

The system pressure was again 6 bar. The lower chamber pressure was 0,2 higher on 5,4 bar.

What could it be?

https://www.youtube.com/watch?v=Sbqq...&frags=pl%2Cwn

https://www.youtube.com/watch?v=zKrO...&frags=pl%2Cwn
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post #26 of 186 (permalink) Old 07-03-2018, 07:15 AM
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From what I can see in these last two videos, LCP is about 0.5 bar lower than SP. That‘s still okay. However, the general pressure level is a bit low, which, as I said in my last post, points to either a problem with the pressure gauge or to wear in the fuel pressure regulator. But that is not the reason for the symptoms you describe.

Assuming that there were no issues before you replaced the filter fitting, my first suspicion was that some dirt particle(s) got into the FD when you changed that filter fitting and clogged the FD‘s restrictor. That can easily happen when the filter fitting or the EHA is changed and it can be quite a lot of work to fix that.

But - provided that your EHA adjustment screw has never been touched (turned clockwise) - your fuel pressure tests show that your FD‘s restrictor is not clogged.

However, dirt particles can also impede the control plunger‘s movability. That‘s why I suggested step 1 in post 18 whereupon you made a video of the AFM plate's movement during cranking. From what I can see in that video that does not seem to have happened either. However, you might want to do an additional AFM/CP movability test as described in the following thread (post 22):

https://www.benzworld.org/forums/w12...o-knows-3.html

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post #27 of 186 (permalink) Old 07-07-2018, 02:18 PM Thread Starter
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Thank you HD for your help!

I read a lot about the Bosch CIS system the last couple of days and decided that I have too many variables at this point. As my SP is 0,2 bar lower then it should I have no history when or even ever the fuel pomps have been replaced + filter I decided to buy those new and take if from there.

More in the next two weeks.
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post #28 of 186 (permalink) Old 07-21-2018, 10:47 AM Thread Starter
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Installed the new fuel pumps and filter today, but still no success. The engine wants to start the second after ignition, but only for a very brief while, see video.

I really don't know what to do anymore.

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post #29 of 186 (permalink) Old 07-21-2018, 11:05 AM
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It that fitting a check valve? Maybe it is defective.
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post #30 of 186 (permalink) Old 07-21-2018, 12:19 PM Thread Starter
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It that fitting a check valve? Maybe it is defective.
No it's a simple little filter, but I wished I had never touched it...
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