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Fuel Gauge Problem????

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monarchd's picture
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I have a 2000 E430 4 Matic . Recently I noticed that the fuel gage is not reading full after refueling. So today I decided to try to slowly fill the tank with surprising results. When I removed the nozzle gas spewed out from the tank....then as I drove the car felt like it was surging....and at the next traffic light it stalled.....started ok but surged and felt like it was going to stall.....drove a short distance and it seemed like the car was again ok.....but the fuel gauge still reads 3/4 full...Has anyone experienced this ? Does anyone know what might be wrong with the gauge....Is it the sending unit....Is this a common problem....my car is still under warranty and I'll be making an appointment to solve the problem...

Thanks for any insight into this problem...

Sal

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I had a 98 E320 with a gauge problem--read less than full after filling, slowly rose a little bit over several miles, but the sender was replaced under warranty at the time and no problems recurred. It seems they have had problems with senders in that era. Be sure not to "top off the tank" at filling--it can put gasoline into your charcoal cannister. Also, when they replace the sender it's wise to have the fuel level low in the tank.

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mark cummins's picture
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It Seems Most all late model Mercedes have Problems with the fuel level sending units!When I Worked for Mercedes I saw Several (Defective) Fuel level sending units on the W203/208/210/163
The Sending unit has been replaced 3 times in my W210 wagon in less than 3 Years and 20k
The Same on my ML 4 Times In Two Years 15k

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It took 5 visits to get my fuel guage working properly in our 2002 C230K. And..it is thanks to this forum. A C230K owner with the same problem posted that they had finally replaced his "SAM" unit and so far so good.
Well..in our car, they had replaced the fuel sensors 3 times...and the sending unit once..all to no avail. The last attempt only made the problem worse; instead of the gauge not always going to full, it would read empty as soon as I reached a half tank.
The info provided here from another C230K owner (before the forum format was changed) was indeed the ticket. Since the rear SAM unit was replaced (at my suggestion), no more problems with the gauge.
Of course, NOW I have a left front blinker bulb that won't work because there is some sort of short (yes, odd as it seemed to me for such a bulb to go so early, I replaced the bulb, blew in a few minutes..same malfunction message) ..and an interior light that has decided to not dim and go out on it's own anymore. This car is truly electronically challenged.
After 40 days in the shop in less than 2 years for a myriad of issues, six visits..and the long wait for service appointments, it is very easy for me to see that Mercedes well deserves their JD Powers ratings.
I have had more problems with this car than almost all of the other (supposedly lesser) cars I've owned combined.
Anyway..hopefully changing your rear SAM unit will fix your problem as well. If anyone has any ideas about the bulb, I'm all ears. It's going in for service tomorrow...for the seventh time.

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Tom Hanson's picture
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Seems to be a chronic problem that is difficult to cure. Keep bugging your dealer until they get it right. I'm suspecting a very large batch of bad replacement sending units.

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Tom Hanson
Supervisor, Parts Operations
Mercedes-Benz Classic Center USA
MBUSA, LLC
thomas.hanson@mbusa.com
949 598-4842 direct.

Prior MB cars: 2010 ML350 Bluetec, 2003 C320 Coupe, 1986 300SDL, 1971 300SEL 6.3, 1973 450SE, 1959 220S, 2011 C300

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Tom, why don't the technicians bench test the sending units before installing them if they are such a trouble-prone item? That would seem more sensible than repeated replacements and dissatisfied customers. Doesn't MB normally issue Technical Service Bulletins for common problems such as this? Perhaps there are so many problems nowadays that they can't keep pace.

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Quote:
Originally posted by Fred Hoelzle
Tom, why don't the technicians bench test the sending units before installing them if they are such a trouble-prone item? That would seem more sensible than repeated replacements and dissatisfied customers. Doesn't MB normally issue Technical Service Bulletins for common problems such as this? Perhaps there are so many problems nowadays that they can't keep pace.

Excellent question. I just returned from the dealership regarding the short for my turn signal bulb. Apparently, the electrical contacts were burned in BOTH sockets..even though only the left one was exhibiting a problem. They (I quote) "installed updated front turn signal harnes s as per DTB PB82."
From what I gather, there is a bulletin about this. My question is, WHY aren't folks notified of these issues so they can bring the car in for repair and replacement before the problem happens?
They seem to have a very difficult time solving these electronic issues. There was a woman there with the same gas gauge problem as countless others..in addition, her brake light would not turn off.
Also, there was a man there with a year old $66K CLK with an integrated phone that has never worked (I have a relative who had the same problem with his CLK) and, the key only works sometimes...but off course, it ALWAYS works when he brings it in to be fixed. Consequently, the problem is still not solved.
$66K...no phone..and a key that only works sometimes. Nice.
He wanted to trade the car in; they will only give him half of what they are selling the same car for on the lot..probably partially BECAUSE of the phone and key issue. He said his next car will be a Lexus.

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Yes it is a pretty common problem,i hear it all the time and if you look back at the old forum this issue will come up every month or so.

As for the phone/lock issue on a $66 car, i am suprised the regional rep or owner/manager of the dealership didnt get involved somehow. I wouldnt be too happy myself, so thats understandable.

I think they dont bench test units is because think of the volume of cars that come in everday and the waiting line of cars to be serviced, if they bench test all "suspected parts" this would take a lot of there time. If you car is under warranty or it is a low cost item, just pitch it and replace it. Thats what i would do if i was a tech.

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hi when the fuel level sending units are replaced 1998-2000 you must also replace the instrument cluster or you will keep having a problem. joeym7

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hi ast makes a very good scanner 3,000 dollars go to some one and ask to do you a favor. joeym7

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