Ok, So, I get my car back from the shop, everything is great, I can now get the car started any time i need to without hesitation. the problem is, when I looked under the hood to see where I was leaking oil from, I noticed that this little bugger was sitting in there Disconnected and looks like it Is leaking Diesel, I know the pre filter connected to this thing, as that's the same clamp I checked to make sure was tight and secure and not sucking air. It's Currently un plugged and open to the air... any ideas on what it is, why it was bypassed?

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed