Question about Alfa Romeo 156

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Petrol gauge erroneous readings wiht warning light staying on. TRhe sender unit has recently been changed with no effect. Kind regards

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  • pj_eccleston May 30, 2009

    Thanks for the info. will check to see whether I have two senders on a 156 and report back.



    Kind regards



    Phil Eccleston

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Have you tried to change the gauge it self, not only that is there any bare wire going from the sending unit to the gauge? these are the only 2 items that you could even have left to do

Posted on May 30, 2009

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Hi,

Your fuel gauge determines your fuel level using a floater in your gas tank that is attached to a lever arm (generally). Gas gauges can be inaccurate if the arm doesn't move freely or if there is very little gas in your gas tank.
Check the fuel sending unit first. It mounts in-tank and tells the gauge what to read. I have experienced "sticking" of one of the sending units .There are two, one on each half of the tank, apparently to increase accuracy of the fuel gauge during hard driving, or perhaps just to improve over the readings given by a single sender. I had luck by adding some fuel system cleaner, and allowing the tank to fully empty a few times, then filling up, in order to push the float to its extreme positions. The float, in case I am being too detailed, rises and falls with the fuel level in the tank, and is connected to a device which offers different levels of electrical resistance...which the gauge responds to in order to indicate the fuel level. Interestingly enough, about the same mileage (95K or so) when it began to do this. Since then, I have logged an additional 30K trouble-free miles. It seems that just one of the senders sticks, causing erroneous readings on the fuel gauge. Mine refused to indicate less than half a tank of fuel. This would seem to indicate that one of my senders was sticking at the full level. The instrument clusters are 100% elecronic, and I have found them to be very reliable I have worked on. I have yet to replace one, although this of course does not mean that yours is not faulty, I would be least suspicious of the cluster, and look for other causes.

Thank You

Posted on May 30, 2009

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