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Check the connector in the back of the car. On the driver's side, where the in-tank pump and fuel gauge connect to the main body harness. In the wagons it is under the driver's side lift-up panel behind the wheel well. The connector blades might be corroded, increasing resistance and decreasing voltage to the pump. I think the connector contacts are self-wiping, so disconnecting and reconnecting a few times should clean them up quite a bit. While you are there, also check the ground connection, if there is one there.
Basically, where ever you are getting the 9.2V reading, between that point, and the nearest one with a reading of 12V, there is increased resistance due to some problem. Could be dirty connectors, could be corroding wire in the harness, etc.
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Scott Cook - 1991 745T, 1986 Toyota Tercel (Don't laugh, it is reliable, faithful AND gets 41 mpg!)
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