Did not read all of the replies. Pressure drops as the water must be moved up hill. I assume that the house is not 400 feet higher than the pump, but that the distance from the pump to the house is 400 feet The link speaks for pressure washers, but the math is exactly the same for residential supply systems. Height causes static pressure losses-- length causes frictional pressure losses. How much higher is the house above the pump? If the pressure at the house is satisfactory when the faucet is first opened, I would consider adding a check valve in the line between the house and the pump and adding a pressure tank at the house-- perhaps an 80 gallon size with bladder. The pump will fill and pressurize the house tank while no water is being used and that will be available when later needed. Probably will supply 15 to 20 gallons per use before the pressure drop becomes evident.
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