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#1
02-20-2008, 01:23 AM
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Fuel gauge no longer working.
Since I've owned my car, 16K miles ago, the fuel gauge has been unreliable. At a 1/4 tank, it would start to bounce around and I wouldn't know what the fuel level was (oh, is that my car running out of fuel? Hmmm...)
So, I've known that the fuel sender probably needed to be cleaned. But I put it off, since it wasn't really that bad... A couple days ago, the reserve light came on right after I had filled up my tank. It would sporadically come on and go off. Then, the needle started to display some erratic behavior, whipping back and forth, just plain going crazy. Then, it settled on Empty and stayed there, where it has been ever since. The reserve light keeps coming on. And going off. And on. Today I finally pulled the sender (getting that big nut loose was a trick!), which had disassembled itself inside the tank! I fished around with a magnet and found the plate for the bottom, reattached it after cleaning everything. Cleaned the contacts, etc. Needle still stuck at E. Is my gauge broken? Is there anything else I could check?
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marshall 1982 300TD (220,000 mi.) 
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#2
02-20-2008, 06:38 AM
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You may want to replace that sender.
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83 SD 84 CD
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#3
02-20-2008, 08:05 AM
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There are a couple of hair-like wires on the sender. Very easy to damage.
It appears you will need to replace the sender. Jim
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14 E250 BlueTEC black. 45k miles 95 E320 Cabriolet Emerald green 66k miles 94 E320 Cabriolet Emerald green 152k miles 85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles
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#4
02-20-2008, 03:38 PM
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My sender only has one (fully intact) wire. Although I can see that the float has two positions, the bottom bracket (the T-shaped plastic end) doesn't appear to be missing any connections for a second wire...
I've read elsewhere that the sender can be checked for resistance. I'm not so good with mulitmeters and such, but hooking one up to the "T" and "G" poles of the sender (the right and bottom poles in the picture) gives me a constant resistance of 320 Ohms (if I'm reading that right...maybe it's 32 Ohms...) Either way, sliding the float up and down doesn't change that reading. Connecting the leads to the other pole (the "W" pole, upper left) doesn't give a reading. I'd like to know if I was testing the thing properly before I have to get a new one.
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marshall 1982 300TD (220,000 mi.)
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