Thanks for the replies.

My guess is that the sending unit is bad. Am I correct in believing that the sending unit has two connectors on it. It is between the valve cover and the air cleaner?

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)