W203 No Fuel Pressure - Page 2 - Mercedes-Benz Forum
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post #11 of 28 (permalink) Old 02-28-2018, 05:23 PM
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Have you changed the CPS?

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post #12 of 28 (permalink) Old 02-28-2018, 06:02 PM Thread Starter
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Originally Posted by Benzyle View Post
You could connect a hose to the schrader valve if you have the right fitting, or otherwise disconnect the fuel line near the driver's side valve cover ,,17mm spanner. and then connect a suitable hose to it to feed into a bucket. Be careful.

If you are sure you have good fuel and good spark and it still wont run the next thing to check is cylinder compression.
Thanks a lot. I found 17mm fuel line connector, and I'll drain gas from there, but I honestly think the gas should be OK, because my wife told me she only got Gas from Costco last few months.

Is it possible that security system error or other electrical issue?
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post #13 of 28 (permalink) Old 02-28-2018, 06:16 PM
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Best of my limited knowledge,if it was a security system or electrical issue you would not be getting a spark and/or fuel delivery.
The fact that you have these means the problem is either water in the fuel/bad fuel or a compression problem.
Unless all fuel injectors stop working somehow ?
Maybe you could remove some spark plugs after some cranking and see if they are wet with fuel to check on this.
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post #14 of 28 (permalink) Old 02-28-2018, 06:19 PM Thread Starter
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Originally Posted by Benzyle View Post
Best of my limited knowledge,if it was a security system or electrical issue you would not be getting a spark and/or fuel delivery.
The fact that you have these means the problem is either water in the fuel/bad fuel or a compression problem.
Unless all fuel injectors stop working somehow ?
Maybe you could remove some spark plugs after some cranking and see if they are wet with fuel to check on this.
Actually when I removed one spark plug after cranking, the plug was wet. Is it normal?
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post #15 of 28 (permalink) Old 02-28-2018, 06:51 PM
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Yes, that tells you that fuel is being injected into the chamber but is not igniting,which is why the engine does not run.
If you have spark and compression then the only thing left to be at fault is the fuel quality.
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post #16 of 28 (permalink) Old 02-28-2018, 07:01 PM Thread Starter
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Originally Posted by Benzyle View Post
Yes, that tells you that fuel is being injected into the chamber but is not igniting,which is why the engine does not run.
If you have spark and compression then the only thing left to be at fault is the fuel quality.
Ok, I'll drain fuel from 17mm connector tomorrow. Thanks a lot!
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post #17 of 28 (permalink) Old 02-28-2018, 07:04 PM Thread Starter
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Have you changed the CPS?
Yes, I did it today. I start thinking I didn't push the harness to CPS enough, so I will also check that tomorrow. Thanks!
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post #18 of 28 (permalink) Old 02-28-2018, 07:09 PM
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Good luck.
But if your CPS is not plugged in then that will be the problem. I think it should 'click' in to place.
Don't drain fuel unless you are sure the CPS is installed properly.
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post #19 of 28 (permalink) Old 03-01-2018, 07:33 AM Thread Starter
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Good luck.
But if your CPS is not plugged in then that will be the problem. I think it should 'click' in to place.
Don't drain fuel unless you are sure the CPS is installed properly.
Benzyle, thank you so much! I drained fuel line about one gallon to check the gas quality just turning the key on an off, and the gas "looks" OK, so I reattached the harness to the CPS, and FINALLY the engine started.

But I have another issue, sigh... The idling is very rough below 1500, when the engine runs above 1500, runs just fine. Should I drain all the gas from the tank and the fuel line? I see random misfire and some other misfire code on ODB.
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post #20 of 28 (permalink) Old 03-01-2018, 09:12 AM Thread Starter
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This is a OBD2 test result. Cylinder Misfire and Open Loop system failure or such...
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