Lifetime Premium Member
Date registered: Feb 2006
Vehicle: '92 400E 5.0; '91 500; '98 CL600; '92 300D, 2.5; 1965 250S, SBC V8
Location: Charleston, SC
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RE: 83' 300d fuel gauge indicator bouncing
give this a try. remove the sender from under the first aid kit in the parcel shelf. you'll need a BIG socket. unscrew tiny nut at the bottom and carefully slide off the alu tube. you will probably find some black gunk around the base. if one of the three wires is broken, junk it, repair affects the resistance and screws it up. if you are able to clean the base, and all looks ok, clean the contacts accross the bottom for the low fuel indicator and climb in the car and plug the unit in. turn on ignition and invert the float, should read full on the gauge, slowly turn over and as the float moves down, the gauge should move too. when contact is made at the base your light for low fuel should illum. carefully clean your contacts if you are not getting the desired result. if that doesn't do it, send a reply and i'll pass along how to test your gauge.