'96 C220 fuel gauge issue - Page 2 - Mercedes-Benz Forum
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#11 (permalink) Old 12-19-2011, 03:03 PM
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Here's the wiring diagram - 26 is the LH sender - 27 the RH

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#12 (permalink) Old 12-19-2011, 03:22 PM
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Originally Posted by Bernard Rother View Post
I'm still hoping someone will point out an earth connection for me .... 16 years old and all !
Bernard.
Here are the earthing points - hope it helps

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#13 (permalink) Old 10-18-2012, 02:44 PM
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Just a thought - is the other tank the reserve? if so it will always be full unless you drive it beyond the reserve warning light?

Have to read up on it

Oberoi
so does that mean one Unit measures the top half of the tank, and the other unit measures the lower half of the tank?
It seems like mine gives me false readings until i reach half a tank, then anything below that seems to be accurate.
please correct me if im wrong but is this how they work?
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#14 (permalink) Old 10-18-2012, 03:09 PM
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Here is what I have found. The two low parts of the tank are sumps one on passenger's side feeds car, other one has a pump that transfers gas to the one for the car supply. If the transfer pump doesn't run, you run out if fuel at the quarter full mark. The guages are arms something like in your commode that over time spreads open and looses contact and gives a wrong reading or spots that have no reading till they touch again. If you are handy, drain the tank and squeeze the slot the float rides in for a temp fix. Correct way is to replace both sides witch will give you a new transfer pump as well.
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#15 (permalink) Old 10-25-2012, 10:18 PM
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im horrible at reading wiring diagrams haha, where can i look at the fuel sending unit wires? where are they along the bottom of the car or inside the car? and where is this bad ground located? i can provide pictures for everyone if you guys can tell me where to find them
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#16 (permalink) Old 10-26-2012, 05:01 AM
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The wires come from the left side of instrument cluster and travel down the right side of the lower body inside the kick panels to where they split off under the rear seat. Remove the rear seat and you will find then going though a grommet on each side. You will have to remove the shields from the sumps on each side to access the plugs, removing the grommets without removing the wires is the easiest way to feed the harness back into the car. The voltage sending wire is fed into the right ( passenger side) senser first, then out to cross to the drivers side senser. From there it travels back to the guage cluster and the cluster reads the voltage drop, I.E. resistance to determine the guage display. There is no true 'earth' on the system other than provided by the instrument cluster.
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#17 (permalink) Old 10-26-2012, 02:40 PM
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Originally Posted by charger13 View Post
The wires come from the left side of instrument cluster and travel down the right side of the lower body inside the kick panels to where they split off under the rear seat. Remove the rear seat and you will find then going though a grommet on each side. You will have to remove the shields from the sumps on each side to access the plugs, removing the grommets without removing the wires is the easiest way to feed the harness back into the car. The voltage sending wire is fed into the right ( passenger side) senser first, then out to cross to the drivers side senser. From there it travels back to the guage cluster and the cluster reads the voltage drop, I.E. resistance to determine the guage display. There is no true 'earth' on the system other than provided by the instrument cluster.
Now i see : i noticed when i move the left side cluster harness with some force while plugged in i get a momentary accurate reading then it works then when i let go the needle on the gas gauge starts to act up again, i made sure the blue/black wire had a good connection but i did not check the ground, what color is the ground wire that runs through the left cluster harness?.

i started having this issue when i switched out a few clusters to test them on my car, then it started to act up.
is there a ground wire on the left side of the cluster harness just for the fuel guage? or for the whole cluster?
Thanks again!
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