No. 1, 2, 3, or 4 PRESS LOW light on.
Indicates the differential pressure across the corresponding engine driven centrifugal boost pump is low. A flickering light indicates a partial obstruction of the fuel line. Note. The FUEL PRESS LOW light should be out by low rpm. After start, possible faulty or stuck pressure switch.
a. If fuel flow and quantity of the corresponding engine are normal and engine continues to operate normally, inspect nacelle for visible fuel. If fuel is visible, secure engine. Note The FUEL PRESS LOW light should be out by low rpm.
b. In flight, if no fuel visible, continue operation, observing engine closely. After start, possible faulty or stuck pressure switch.
c. During ground operations, if no fuel is visible, cycle respective boost pump or shift engine to normal rpm then back to low rpm. If light goes out and remains out, continue operation.