This is for a 1987 300SDL - this car is new to me... I filled it up and started driving on a long journey home. When the fuel level got down to about 1/4 I started watching it and looking for a station. It was then that I noticed that the fuel gauge behaved strangely: it kept jumping from 1/4 full all the way down to completely empty, then back up again. There was no pattern to it - not that I could pick up... it was doing it even when standing still and not moving! When I filled it backup it was back to normal producing smooth indicaiton of where the fuel was....

Is it the fuel sender unit, perhaps or something else to check?! Are there any serviceable parts in the fuel sender unit?

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1987 Mercedes 300SDL; SOLD
1985 Mercedes 300D; SOLD
2006 Honda Pilot - wife's ride; 122K;
1995 Toyota Land Cruiser - 3X locked; 182K