C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

Fuel System problems

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Old Mar 28, 2012 | 11:09 PM
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2003 Mercedes C240
Fuel System problems

I have a 2003 C240. I'm not getting any fuel to the fuel rail. I have replaced the Fuel pump, the filter and the MAF. The car started and did ok it had a little bit of a delay when you stepped on the gas. Other then that it worked pretty good. About a month later the car died out on me. No fuel to the fuel rail.
The only thing I haven replaced at this time is the sending unit on the drivers side. I sure hate to spend $500 if there is no way in heck this could be the problem.

Any ideas?

Oh a side question. There is a hose/pipe that sits behind and to the right of the MAF. What the heck is this? It almost looks like some sort of PCV but I don't think it is.

thanks for any pointers or advice
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Old Mar 29, 2012 | 10:19 AM
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
I think you have suffered another pump failure.
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Old Mar 29, 2012 | 10:04 PM
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2003 Mercedes C240
GLYN,

You don't think it could be the sending unit?
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Old Mar 30, 2012 | 05:32 AM
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
No. All the sender unit does is drive your fuel gauge.
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Old Mar 30, 2012 | 01:12 PM
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2003 Mercedes C240
Glyn,
You were right on the money! I took the fuel pump out and inspected it. I noticed the screen had turned from white to black. I also noticed some deposits. I cleaned the screen, removed the small deposits let the them dry. Reinstalled them and BLAM! The car started right up and took off. A little hesitation when I first step on the gas, but it goes. Oh another observation was the gas in the fuel pump was a dark gray.


Question now is: Any idea on what the deposits were? What could be causing this? I only use premium gas, but I do go to where the cheapest fuel prices are. Maybe bad or low quality gas?
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