Low Fuel Light Always On - Mercedes-Benz Forum
 
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post #1 of 7 (permalink) Old 03-15-2010, 08:19 PM Thread Starter
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Low Fuel Light Always On

1984 280SL

Replaced all bulbs in the instrument cluster. Now, the low fuel indicator light stays on even though I know there is at least 3/4 of a tank. FYI, the gauge dances around and becomes erratic when below 1/2 tank. I haven't gotten around to adding a ground yet but pulled a strand of brown ground wire from another MB (I know, I know, the ground wire doesn't HAVE to be brown... I'm just anally retentive that way) so, will be doing so soon. Also, haven't pulled the fuel tank sending unit or screen yet.

So, tell me why the light is staying on all the time. Thanks. Oh, did a forum search and didn't find a directly relatable thread (happy to go there if someone points me in that direction).

Put it back together? Sure honey, no problem.
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post #2 of 7 (permalink) Old 03-15-2010, 08:31 PM
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I vote for fuel sender.
https://www.benzworld.org/forums/r-c1...er-repair.html

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post #3 of 7 (permalink) Old 03-15-2010, 08:32 PM
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the light and sending unit are ground activated, so if you lost your ground while pulling the cluster, an erradic reading is possible. Remove your speaker to gain access to the back of the cluster and attach a temp ground wire and see what happens.
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post #4 of 7 (permalink) Old 03-16-2010, 03:58 AM
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pulled my cluster yesterday for needle painting, clock repair and had gained about 1/2 a tank of gas and had the low fuel light too. I made me about a 16 inch wire and put one end under one of the streering shaft mounting bolts just behind the cluster and the other to the cluster ground screw. Lost that 1/2 tank of gas and the light.
I was very easy with the parts and still broke the ground somewhere. Did the same things on my 450 a few years ago when I did that cluster.

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post #5 of 7 (permalink) Old 03-16-2010, 06:58 AM Thread Starter
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Thanks. I'll try the new ground first and then, move on to the sending unit.

"I love it when a plan comes together." Hannibal

Put it back together? Sure honey, no problem.
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post #6 of 7 (permalink) Old 03-16-2010, 08:43 PM
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1984 280SL

Replaced all bulbs in the instrument cluster. Now, the low fuel indicator light stays on even though I know there is at least 3/4 of a tank. FYI, the gauge dances around and becomes erratic when below 1/2 tank. I haven't gotten around to adding a ground yet but pulled a strand of brown ground wire from another MB (I know, I know, the ground wire doesn't HAVE to be brown... I'm just anally retentive that way) so, will be doing so soon. Also, haven't pulled the fuel tank sending unit or screen yet.

So, tell me why the light is staying on all the time. Thanks. Oh, did a forum search and didn't find a directly relatable thread (happy to go there if someone points me in that direction).
If these symptoms only started AFTER fiddling with the cluster then I too vote for grounding the cluster.
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Soldier on Old Chap. The Pig is you and you are the Pig.




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post #7 of 7 (permalink) Old 03-17-2010, 08:45 AM Thread Starter
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No, the fuel gauge has been dancing since I got the car last year. Interesting note though, the gauge is now approaching 1/2 and I have not seen any sign of the needle starting its "Irish Jig" SINCE I pulled out the cluster last week and replaced all bulbs. The low fuel light is still on, though. I will add the additional ground first (thanks for the pics!) and see what happens.

Put it back together? Sure honey, no problem.
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