No start after filter replacement fuel distributor - Page 2 - Mercedes-Benz Forum
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post #11 of 186 (permalink) Old 06-13-2018, 03:51 AM
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Seems unlikely that it has been affected by a simple fitting swap, but I think you may have to try adjusting that intake plate.
Do it in much smaller increments than that bold fellow in the YT video and remember where you started so you can return there if it doesn't work.
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post #12 of 186 (permalink) Old 06-13-2018, 09:04 AM
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A Mystery! I agree with Dugald. The plate looked "closed" but why would it be different from before? And thanks for the filter info. I had no idea it was there. Wishing you a fast solution. Please keep us posted

John
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post #13 of 186 (permalink) Old 06-13-2018, 03:16 PM
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Agreed, Dugald is on the money.

I would first make sure you're actually getting the right amount of fuel pressure. Maybe Murphy paid you a visit and something is causing the pumps to pump less.

One tip I may add, unbolt the injector hardlines and adjust the air metering screw until you reach the point that fuel dribbles out of the top of the ports.

Then hook everything back up and see if it starts. The car should fire up, but you'll need a duty cycle meter to dial it in further.
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post #14 of 186 (permalink) Old 06-13-2018, 11:53 PM Thread Starter
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Ok, thanks guys. I am going to follow that route. This YT movie also points in the same direction.

I don't have the car next to my home, so I'll refer back to you guys in the weekend.

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post #15 of 186 (permalink) Old 06-18-2018, 12:31 PM Thread Starter
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Didn't have much time last weekend, but did a few test and it I start to have the feeling that there might be not enough fuel pressure to make it all the way thru the FD to the injectors.

I ordered and fuel pressure gauge to obtain a reading, but the have the fuel pumps running constantly is there really only one way to jumper them by diving deep into the dash and jumper pin 30 with 87? No easier way?
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post #16 of 186 (permalink) Old 06-18-2018, 02:13 PM
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You can jump 12v directly to the fuel pump terminals.

Did you ever try putting the old filter fitting back in?
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post #17 of 186 (permalink) Old 06-19-2018, 12:15 AM Thread Starter
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Quote:
Originally Posted by dugald View Post
Did you ever try putting the old filter fitting back in?
Yes, no difference. I have fuel on the cold start valve, but not on the lines to the injectors, so I am suspecting that I don't have enough pressure to push the fuel thru the FD.
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post #18 of 186 (permalink) Old 06-19-2018, 01:55 AM
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Hello Bauk18,

I‘m actually not active in this forum … I just wanted to browse a little in it and the first thread at the top (this one) caught my eye.

I suggest the following:

1.) Check if the air flow meter plate moves (about a centimeter or so) away from it‘s (correct) rest position when you (try to) start the engine, and check if it moves further down if the throttle is completely opened during starting.

2.) If that‘s the case, check the fuel pressure … “system pressure“ (SP) and “lower chamber pressure“ (LCP).

Quote:
Originally Posted by Bauk18 View Post
... I start to have the feeling that there might be not enough fuel pressure to make it all the way thru the FD to the injectors. ...
Assuming that there were no issues before you replaced the FD filter fitting, there might be too much fuel pressure … in the lower chambers that is. … With ignition off and fuel pumps running, LCP shoud be at least 0.3 bar (4.5 psi) lower than SP.

If the difference is smaler … and I‘ll have enough time … I‘ll explain a possibly helpful next step.

If that step will be successful, I‘ll tell you what happend when you replaced the FD filter fitting. …

H.D.
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post #19 of 186 (permalink) Old 06-19-2018, 04:57 AM Thread Starter
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Danke shön H.D! I have a pressure meter underway, estimated delivery end this month, so I'll get back to you asap op step 2. On step 1 I'll make a movie later today and post it.
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post #20 of 186 (permalink) Old 06-21-2018, 10:45 AM Thread Starter
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The air flow plate moves when starting and it moves deeper when throttle is further open.
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