May be a few problems. Number one would be the age of the pump, it may be time to rebuild it or replace it.
Number two, the pump only has a certain amount of lift. The lift is certified when new. The pump is 8 years or so old so the lift isn't like it was when new. Here again, replace or rebuild.
When the water level is high the lift on the pump is strong, as the level drops so does the lift, especially on an old pump.
You know what I'm gonna say next...............
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2013 Voltage 3800, 2012 Chevy 3500 HD
2010 Yamaha V Star 950
2009 Yamaha Raider
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