I am seeing a white surge of what i suspect maybe air in the hard plastic line coming from lift pump to spin on filter housing on my 1983 w123 300D us spec, im having battery drain every morning since about a week ago and im ruling out air in the system as the cause.
I see no bubbles but rather a whitish surge of what could be normal fuel ???
THANKS!

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W123 1985 300TD naturally aspirated