107 380sl fuel sending unit - PeachParts Mercedes-Benz Forum

Tony1628 · #1 04-23-2003, 09:23 PM

I replaced the light in the instrument cluster. Now the fuel guage doesn't work. It reads empty and barely move. I suspect is the fuel sending unit, where can I find the fuel sending unit?
thanks.

mbdoc · #2 04-24-2003, 08:32 AM

It lives in the soft top storage area under a white plastic cover.

Tony1628 · #3 04-24-2003, 01:14 PM

Thanks for the info.. I should've check the maint cd first.. It looks like the sending unit is all gumed up.. The car was sitting in a hanger for the past 3 years.

maheath · #4 04-24-2003, 05:01 PM

I've seen several people state similar problems after removing the instrument cluster. Breaking a ground connection seems to be a common problem. You might want to check for that.

Tony1628 · #5 04-25-2003, 03:42 PM

The gauge went back upto 3/4 full (it should be full tank). I check the ohmage between the terminal G & T (83 ohm) and I put 20 miles on it and now it read 31 ohm.. I will take the sending unit out and clean it once in for all.. Thanks for the advice...

Tony1628 · #6 04-29-2003, 12:15 AM

Well, it turned out it was not the sending unit afterall. Check the ohmage and I did see it change. I attached a pot to the plug and adjusted the pot and saw the gauge from full to 3/4 smoothly then it just poped to empty and jump back and forth to 3/4..
That lead me to suspect it is the gauge.. Now I will try to attach another ground wire to the cluster and see if that help..