Fuel thermostat. There's an o-ring available from the dealer and very likely from Phil through the Buy Parts link at the top of the page. O-ring is 011 997 39 48. If the plastic nipple fitting is broken, it's 601 078 00 16.
[edit] Yes, the o-ring is $1.70 plus shipping on FastLane.
Sixto
87 300D
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