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Old 04-03-2018, 01:31 PM
billhard billhard is offline
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Join Date: May 2008
Location: southern CA
Posts: 416
W108 Need help diagnosing bad fuel gauge reading.

The fuel gauge on my 1972 280SE 4.5 stopped working about a month ago. Now the gauge reads full whenever the key is on regardless of tank level. I have pulled the sending unit and checked the resistance, 5 OHMS when the float is at the top of the sender, 67 OHMS at the bottom, progression in between the two ends seems to be linier.

Given this, should I be looking at the gauge next? Am I checking the sender correctly by testing resistance on the workbench?

Thanks for any ideas.
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1972 280SE 4.5
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