Pressure gauge indicates zero during normal operation???

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Everything about the filter looks ok, so maybe the gauge is bad.

In this picture, the pressure is about 4 psi.

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This one shows about 10 psi.

The height difference will make about 1 psi difference, so there is still about a 5 psi discrepancy.
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14 PSI indicates about 4 psi higher than the other gauge, which is possible due to the pressure in the pump vs. outside the pump.

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9" Hg is about 10.2 feet of head.

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If the suction is 10.2 feet and the pressure is 23 feet of head, the total is about 33.2 feet and the flow is about 105 GPM.

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"If the suction is 10.2 feet and the pressure is 23 feet of head, the total is about 33.2 feet and the flow is about 105 GPM."

Pressure is 14 psi x 2.3 ft of head/psi = 32 feet of head and the suction is 10.2 feet of head, total is 42 ft and flow is 90 gpm

I'm using the pressure at the pump drain opening,
 
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