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Originally Posted by reddog
My 82 sd did the same thing. Full pressure on start up, and gradually coming back to zero. It was the pressure sending unit, diaphram had a hole in it. Right before I replaced it, it started to leak out the vent hole.
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Where is the pressure sending unit located? When it develops a leak, are you actually losing oil pressure, or does teh guage just 'read' less pressure?