If you have no pressure you have to have a stuck (open) pressure relief valve somewhere. That is just about the only thing I can think of that can cause that sort of thing. Possibly the addition of the extra fluid alleviated any cavitation you may have been having and allowed the pressure to spike to normal levels further sticking an already stuck open relief valve. Off of the top of my head that is the only thing that makes sense.
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Today's Featured Article - The Collection of a Lifetime - by Sherry Schaefer. The larest gathering of orphan tractors ever assembled by one collector will be auctioned off on May 15 in Rock Island, IL. Ed Spiess was a well known tractor buff who spent most of his time dreaming of rare and unknown tractors. His background as an agricultural engineer sparked his interest in the unique attributes of the models built from 1939-1959.
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