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, maybe the mechanical pump is collapsing the rubber fuel line coming in to it, thus causing the output pressure to drop to 2 to 3. Then when you switch the electric pump on it opens the collapsed rubber line back up and the pressure is restored. That would do it... and it would be a damn tricky gremlin to find.
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And maybe the filter inside the electric fuel pump is partially dirty and restricting the flow of fuel to the mech pump....then when the electric pump is activated, it forces enough fuel to the mech pump to provide enough fuel for the engine.....
I'm just saying ...gremlins do exist with a 15 year old pump...