Sounds like the sender. That is also a pain to change. Find someone with really small hands and arms to help. Smoke is most likely from a oil leak or a leaky hose on the smog pump

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1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero