I think I may have found the problem here. I took a look at the filters and such and noticed that there is a small bit of diesel down around the fuel preheater. I'm wondering if it is possible that when the temp drops below a certain point, there is enough contraction on that unit to cause some leakage. Anybody know if tightening the bolts holding the preheater to the block have any effect on diesel leakage, or would that just have the effect of keeping coolant from leaving the block?

BTW-- the car started immediately this morning after sitting in the barn (level) all night, albeit it didn't drop below 20 last night.


UPDATE...

Just went out and ran the car... definitely bubbles between the preheater and the prefilter (looks like the flippin' Mr. Bubble factory!) Anyone have a diagram of parts in this area? I'm heading down to tear off the manifold once again and see if there's anything obvious leading to/from the preheater.



Thanks!

-l-

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'84 300d turbodiesel (83K miles)
'96 300d (226K miles)
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other fine diesels...
'99 Polaris diesel (Fuji Heavy Industries single)
'01 Diesel Trail gator (Yanmar triple)
'95 John Deere 970 (Yanmar quad)
'11 BMW 335d
'12 VW Jetta TDI

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'00 BMW K1200LT
'02 BMW R1150RS

'15 BMW R1200GSA