W203 No Fuel Pressure - Mercedes-Benz Forum
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post #1 of 28 (permalink) Old 02-24-2018, 11:13 AM Thread Starter
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W203 No Fuel Pressure

Hello, I have this issue and I wish someone could give me an advice.

1. The engine stops at the parking. Restarted but very unstable RPM and stops soon. After a few try, zero RPM, no start at all, cranking is OK.
2. Schrader valve on the fuel line at the engine has no pressure now.
3. Fuel Pump relay and fuse should be OK, and fuel pump is making zzzz noise for a few sec when the key turns on. I'm not sure if the fuel pump is OK>
4. Gas meter shows 1/4.

I'm wondering what procedure I should do next.

Thank you very much in advance. Have a nice weekend, guys.
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post #2 of 28 (permalink) Old 02-24-2018, 11:15 AM Thread Starter
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The car is C320 Wagon 2002.
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post #3 of 28 (permalink) Old 02-24-2018, 11:33 AM Thread Starter
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Sorry for too many posts at once...

I realized that I have not changed Fuel Filter last 10 years (or 100000 miles). It can be clogged?
BTW, I changed spark plugs recently, and they look OK (gray), except a few were black.

No error code with ODB2 and Movi Pro.
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post #4 of 28 (permalink) Old 02-24-2018, 01:24 PM
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It could be your fuel pump or fuel pressure regulator which is built into the fuel filter. One think I would try is adding another 5 gallons of fuel and checking to see if problem goes away. If that resolved it then it's your fuel pressure regulatir/filter. If it doesn't then it's the pump. When I had this problem on my 02 c320 wagon at 150k miles, I replaced both the FPR/filter and pump. It turned out to be be a bad pump but I felt better replacing both at the same time. I think I spent $100 total in parts.

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post #5 of 28 (permalink) Old 02-25-2018, 07:13 AM Thread Starter
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Thank you so much!
I will buy filter and pump from amazon today, and replace the filter first. If it is a filter (hopefully), I may return the pump.
My C320 is 180000 miles. Too many electronics failures (door lock etc), but car still runs very well.
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post #6 of 28 (permalink) Old 02-28-2018, 12:19 PM Thread Starter
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Well, C320 engine still doesn't start after changing fuel filter, fuel pump, and CPS. Battery is recharged, and the motor cranks.
Any Fuse that I should check?

Please someone help!
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post #7 of 28 (permalink) Old 02-28-2018, 02:18 PM
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Check for fuel pressure when cranking.
If fuel pressure is ok,maybe bad fuel, drain and refill with new gas.
Check for spark.
If no spark,check all ignition system wiring and battery terminal connections are clean and tight.Also check the engine ground connection is good.
Good luck.

Last edited by Benzyle; 02-28-2018 at 04:45 PM.
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post #8 of 28 (permalink) Old 02-28-2018, 02:50 PM Thread Starter
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Thank you for the advice.

Fuel Pressure is fine.
I just removed one plug and checked spark. It looks like plug sparks OK. When trying to start engine it sparks every second.
I added 1 gallon of Gas, but it didn't change. The fuel meter is about 1/4.

Any other idea?
I would really appreciate it for any advice!

Quote:
Originally Posted by Benzyle View Post
Check for fuel pressure when cranking.
If fuel pressure is ok,maybe bad fuel, drain and refill with new gas.
Check for spark.
If no spark,check all ignition wiring and battery terminal connections are clean and tight.Also check the engine ground connection is good.
Good luck.
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post #9 of 28 (permalink) Old 02-28-2018, 03:27 PM Thread Starter
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How I can drain Gas from the fuel line?
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post #10 of 28 (permalink) Old 02-28-2018, 04:43 PM
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Quote:
Originally Posted by kaigen View Post
How I can drain Gas from the fuel line?
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.
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