City of Miami Fire Department Driver-Engineer Practice Test

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Pump may not shift if air pressure is below ______ psi.

70 psi

80 psi

The mechanism that shifts the pump is air‑actuated, so it needs a minimum air pressure to operate reliably. When the air pressure in the system drops below eighty psi, there isn’t enough pneumatic force to move the shift valve and engage the pump in pumping mode. Keeping pressure at or above this threshold ensures the shift can occur and stay engaged. The other numbers are not the standard minimum threshold used to guarantee reliable shifting.

90 psi

100 psi

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