I am sorry to mention this now. But did you look at the flex plate/torque converter to see if the bolts were loose, or the flex plate cracked? Either can make noise that mimics a fuel pump or other noise from the front of the engine. It doesn't make sense, but it can. I say this because you said the AT line pressure was excessively high and the noise starts after 15-30 seconds. This is the approximate time it takes the trans pressure to build as well as engine oil pressure. Before you possibly take the engine out, take the converter cover off and check the bolts. Also get your camera up in there and look at the flex plate bolts. When the plate cracks, it will usually leave a rust trail, radiating from the bolt holes. Give that area a look before going too far into the engine.
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