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Old 11-08-2009, 06:53 PM   #1 (permalink)
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Fuel Sending Unit Repair?

Is there a way to fix the fuel sending unit on a 1996 S420. My gauge sometimes show erratic fuel level and very slow to move from empty to the right level.. I am trying to see if there is a way to clean the old one before I buy a new one.
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Old 11-08-2009, 08:00 PM   #2 (permalink)
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Don't know but I've always wanted to try that, perhaps soaking in lacquer thinner to dissolve the crud and varnish. You've got nothing to lose if it's gone.
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Old 11-08-2009, 08:27 PM   #3 (permalink)
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yes it is possible to be cleaned, but you can only inspect the sending unit ones you take it out of the tank. Normally those things don't cost much.
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Old 11-08-2009, 08:48 PM   #4 (permalink)
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It can be cleaned, I did it on my cl. Just be careful removing the clip. There is a special tool to remove the locking ring that gets brittle. Loves to break. be slow about removing and you will be ok. Dont soak in thinner tho, use a good degreaser and follow up with c.l.r. it works great!
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Old 11-09-2009, 08:09 PM   #5 (permalink)
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Thank you all for the help. What kind of special tool do I need to remove the clip? Is the clip available from the dealer in case I break it?
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Old 11-10-2009, 06:25 AM   #6 (permalink)
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yes it is possible to be cleaned, but you can only inspect the sending unit ones you take it out of the tank. Normally those things don't cost much.
For some reason this is an exception to that rule - later V8s are well over $200. I can remember buying 124 fuel sending units for $30 just a few years ago.
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Old 11-10-2009, 10:19 AM   #7 (permalink)
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The w140 is the exception to the rule. If that doest work i have a sender, Your welcome to it. The tool is aval from the dealer. If you wanna spend alot of money. I can show you how to make one if your interested. The sender i have is from a 95 s500. Im not sure the year of your car but see if it will work and get back to me.

Pat
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Old 11-10-2009, 01:56 PM   #8 (permalink)
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The w140 is the exception to the rule. If that doest work i have a sender, Your welcome to it. The tool is aval from the dealer. If you wanna spend alot of money. I can show you how to make one if your interested. The sender i have is from a 95 s500. Im not sure the year of your car but see if it will work and get back to me.
The 1995 is completely different part for some reason - and well less than half the price of the 96-.
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Old 11-10-2009, 02:26 PM   #9 (permalink)
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The part number may be diff but i think its the same part.Ill do a interchange on it.
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Old 11-10-2009, 02:53 PM   #10 (permalink)
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The parts don't even look remotely similar, which is not say they don't interchange, have to get them side by side.
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