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Alex, Since this is on the ford board and you eariler stated a 631 I am going to assume that your talkin bout a 601 series ford tractor. Since you had pressure for a moment, and them went away, I will also assume that you have plenty-o-oil in the pan. Now if and when you start it you have pressure then it go's away, then the 2 most likely events are - your pumping all the oil out of the pan -or- losing prime (sucking air). Unless there is oil all over the place I shall also assume thats its (oil) is still in the engine. So given all that, I believe that it has the 134CI red tiger engine. The pickup tube on them is on the bottom of the oil pump held on with two bolts. I would look for reasons to loose prime. Drain oil and verify that you have little more that 1 gallon (4-5 quarts) in it. Drop pan and look / inspect oil pickup tube. (loose bolts, broken tube, etc...). If not and all looks ok, pump is roughly $60 bucks. I suspect that it a pickup tube problem. Its sounds like when all the oil in the pan she starts out fine but when the level falls a little you loose pressure. FYI - On my NAA (134CI), the filter drains back into the block. If I check the oil prior to running the engine for a while it will appear full, but really isn't. But I have learned that if it shows full prior to running it, its really 1.5 quarts low.
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