fuel stays only in driver's side of saddlebag tank - Page 2 - Mercedes-Benz Forum
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post #11 of 16 (permalink) Old 08-13-2019, 07:52 AM Thread Starter
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Pump not powerful enough????

I don't know if this is true or not but on one site somebody claimed that Mercedes found the c240 4matic fuel pump to be not powerful enough and upgraded it to a more powerful pump.

A pump that had insufficient power could possibly cause fuel not to be sucked out of the left hand side of the tank.
But those things are expensive and I'm not going to get a different pump unless
this is verified that there are pumps out there that have more power;

has anyone else heard this claim?

also; I can access the installed pump and test if for the amount of pressure its putting
out but I don't know how to measure pump pressure;
would it work if I use the same gauge used to measure pressure from the rail and attached
it directly to the fuel pump?
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post #12 of 16 (permalink) Old 08-13-2019, 04:26 PM Thread Starter
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1. could someone please tell me what the two fuel lines on top of the fuel sender unit (left side) do?

the smaller of the two lines appears to have collapsed and I'm going to have it replaced.

Also will replace the thicker line as well.

Also:
the fuel filter is a cheap knock off so I ordered a new Mercedes filter from amazon;
the Filter has the regulator inside. A cheap filter probably means a cheap regulator; I have read
of Chinese-made (clone Mercedes) fuel filters failing after a short period of time.

2. could someone with knowledge of the fuel flow in the C240 please tell me the purpose of the
two lines on the left side of the fuel filter (with the dimple on top)?

3. also: the two lines on the right side of the fuel filter: what do they do?

I guess those should be replaced too. My guess is they run to the
fuel filler near the right side of the car.


or it could be the reverse; the lines on the left side could be running to the sending unit; I don't know
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post #13 of 16 (permalink) Old 08-14-2019, 08:11 AM
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On the sender on the left side of the tank, one line is for fuel delivery to the engine. This of course goes through the filter. The other is a return line from the vapor recovery system, which comes from the filter. Looking at the filter, there are four lines. One end has what I think you are calling a "dimple", which is more of a "boss" or "header" where the center line exists. This is the purge line, which is connected to the vapor recovery system. The other line on the end is the output to the fuel rail. On the opposite end, the center hose is the supply lien from the tank (connected to the sender unit) and the other one is the return line that dumps fuel and vapors from the recovery system back into the tank (also connected to the sender unit).

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post #14 of 16 (permalink) Old 08-14-2019, 01:55 PM Thread Starter
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wow; thanks a lot Rudeney!

I bought OE fuel lines for both the large line (fuel) and the smaller (vapor) line;

I will only replace the lines on the left side of the car (going to & from the sender unit) as the others are good
and they are very short, leading to metal tube fuel lines.
Purchased OE fuel line clamps.

Removed old fuel filter (no markings on it anywhere: presumably from China).

Waiting for OE Mercedes filter to arrive.

I read a post by a guy who had the same problem as I'm having. It turned out to be
a failed fuel filter (which contains the fuel pressure regulator internally).

I was shocked that I could get the Mercedes brand fuel filter for only $40 from Amazon which included free delivery.
The Bosch fuel filter and the Mahle fuel filter were priced almost the same.
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post #15 of 16 (permalink) Old Yesterday, 06:55 PM
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My only concern in buying parts from places like ebay and Amazon is that they are rife with fakes. I tend to buy critical brand-name parts from dedicated, reputable parts stores (RM European, AUtohauz AZ, Pelican, FCP Euro, etc.)

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post #16 of 16 (permalink) Old Today, 08:58 AM Thread Starter
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Quote:
Originally Posted by rudeney View Post
My only concern in buying parts from places like ebay and Amazon is that they are rife with fakes. I tend to buy critical brand-name parts from dedicated, reputable parts stores (RM European, AUtohauz AZ, Pelican, FCP Euro, etc.)
Good point! I didn't think about that;
I hope this fuel filter is the real deal;

from now on I'll be using:
AUtohauz AZ, Pelican, FCP Euro
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