Fuel sender repair - Page 3 - Mercedes-Benz Forum
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post #21 of 41 (permalink) Old 02-08-2016, 01:05 PM
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How hard is it to get at the sender and get it out to repair it?
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post #22 of 41 (permalink) Old 02-08-2016, 01:29 PM
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How hard is it to get at the sender and get it out to repair it?
Access is under that big plastic plug in your soft top stowage compartment.

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post #23 of 41 (permalink) Old 02-08-2016, 03:55 PM
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Once you remove the plastic cap, unscrew the sending unit and you are done. It takes about 3-5 minutes.
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post #24 of 41 (permalink) Old 02-08-2016, 04:13 PM
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Once you remove the plastic cap, unscrew the sending unit and you are done. It takes about 3-5 minutes.
Not necessarily true on the early models. On them there are several 8MM? nuts to remove. It is not the 46MM screw on.
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post #25 of 41 (permalink) Old 02-08-2016, 07:45 PM
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Seems like we had a post a couple of years ago where the 46mm socket wouldn't fit because the gas tank was mounted a little off and the sender was not centered in the access hole. Searched but couldn't find it. IIRC the op had to grind off some of the metal on the outside of the socket to make it seat.
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post #26 of 41 (permalink) Old 02-09-2016, 03:59 AM
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Seems like we had a post a couple of years ago where the 46mm socket wouldn't fit because the gas tank was mounted a little off and the sender was not centered in the access hole. Searched but couldn't find it. IIRC the op had to grind off some of the metal on the outside of the socket to make it seat.
I think that was the tank screen.
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post #27 of 41 (permalink) Old 02-09-2016, 04:15 AM
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I think that was the tank screen.
That's exactly why I haven't replaced my tank screen.
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post #28 of 41 (permalink) Old 02-09-2016, 04:20 AM
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I took the sending unit out and measured the lenght of the resistor cable from the contact points when the float is all the way down. The distance is about 15" of cable. Based on a target reading at that position of 69 Ohms. We will need a cable with a resistance of about 55.20Ohms/ft. Looking at the ones available I will say a 38 awg cable has a resistance of 53.60 Ohms/ft, that is close enough for me. I will order the cable. And I will post the results once installed.

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post #29 of 41 (permalink) Old 02-09-2016, 03:17 PM
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Once you remove the plastic cap, unscrew the sending unit and you are done. It takes about 3-5 minutes.
You're kidding me. You mean I could have a functional gas gauge rather than waiting for the reserve light?
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post #30 of 41 (permalink) Old 02-17-2016, 09:22 AM
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Update, I got the 38 AWG resistor wire, all 100ft. I proceeded to weld the wire to the fuel sending unit and....... it works. I got a functional fuel sending unit!!.

The only note that I have is that the reading from testing the sending unit outside the tank do not move the needle 100% to the Full or Empty positions. The needle stays goes 90% of the way to full and it stays 10% short of Empty. I guess there still some different gauge cable that will take it all the way to Full or Empty.

But still a 90% accurate sending unit for $6.00 and I can live with that!
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Last edited by ivanuf; 02-18-2016 at 05:35 AM.
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