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Old 10-13-2011, 02:57 PM   #21 (permalink)
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I have an 03 with the same fuel gauge issue. Has anyone had success using the# 5 fuse trick or is there something else I need to do to fix this on the 03?
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Old 10-13-2011, 04:18 PM   #22 (permalink)
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Mine is working perfect now, that is because I had to replace the fuel pump assembly.
When I checked the old pump, contacts on sending unit were dirty, coated with soot.
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Old 10-13-2011, 04:29 PM   #23 (permalink)
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Bernard do you think it would work if you cleaned it and put it back?.
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Old 10-13-2011, 05:38 PM   #24 (permalink)
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Fuel pump update - open hart surgery

Yes, it will.
But a bit of work have to be done to take the pump out.
I actually did that and put it back together but two days later my low fuel pressure problem came back, I could only do 35mph maximum. Sending unit and primary fuel filter built into pump are in first picture.
Here is my old fuel pump after cleaning, last picture is Pierburg fuel pump motor with bad (worn out) carbon brushes.
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Fuel gauge problem-dsc01470.jpg   Fuel gauge problem-dsc01471.jpg   Fuel gauge problem-dsc01472.jpg   Fuel gauge problem-dsc01548.jpg  

Last edited by mbenz80; 10-13-2011 at 05:41 PM.
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Old 10-13-2011, 05:48 PM   #25 (permalink)
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Fuel pump issue to the side for the moment, fuel sensor issues in the tank can often be recoevered using Stabil Blue (Marine Formula) in two tanks of gas over a 500 mile or so interval, the Stabil cleans up the fuel sensor in the tank... actually really good for that specific issue as well as prevents that specific issue.
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Old 12-21-2011, 03:12 PM   #26 (permalink)
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Does anyone know where exactly Fuse #5 is in the RSE2 Fuse holder for a 2k ML55?
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Old 12-22-2011, 01:06 AM   #27 (permalink)
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Here it is.
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Old 12-22-2011, 01:42 PM   #28 (permalink)
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yet again 43sqd, thank you!
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Old 06-06-2012, 03:54 PM   #29 (permalink)
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Hi:

I have a 2002 ML320, which has been experiencing the symptoms of the faulty fuel gauge.

I tried the workaround of unplugging the fuse.

When unplugged the fuel needle (and other controls) continued to show levels. They did not "fall to zero" like when you turn the car off. What DID happen is that the car would not turn on. The ignition worked but then it seemed as if the fuel pump was off because it would not start.

Is this what is supposed to happen when unplugging the correct fuse for the workaround?

After unplugging and reinserting the fuse, the car of course worked normally, but I did not see any material difference with the behavior of the fuel gauge.

Does that mean that the only solution is to change the sender (with fuel pump)?

Thanks
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Old 06-06-2012, 05:03 PM   #30 (permalink)
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My fuel gauge is at times a little off. But what surprised me was if i use texaco fuel which in the uk is owned by chevron, may be wrong but i think i am right, contains techron as a fuel additive. If i fill my tank my fuel gauge starts working better without a shadow, and it does not take long. The expense kills me though.
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