Definition
An engine instrument that displays the pressure of fuel being delivered to the carburetor or fuel injection system, typically measured in pounds per square inch (psi). It is fitted to airplanes equipped with an engine-driven fuel pump, and its reading reflects whether fuel is reaching the engine at the pressure the manufacturer requires for normal operation.
Plain English
A cockpit gauge that shows how hard fuel is being pushed toward the engine. If the needle drops out of the normal range, fuel may not be getting to the engine properly.
Context Anchor
Seen on the instrument panel during normal engine checks and during emergency troubleshooting after a loss of engine power.
Derivation
Gauge comes from an old word meaning a standard measure. That helps here because the instrument is not the fuel source itself; it is the measuring device that shows whether fuel pressure is within the expected range.
Why Pilots Care
A low or zero reading helps diagnose whether an engine issue stems from fuel delivery failure instead of ignition or mechanical problems.
Intuition Check
Do not confuse the fuel pressure gauge with a fuel quantity gauge. Fuel quantity tells how much fuel is in the tanks; fuel pressure tells whether fuel is being delivered to the engine with enough push.
Example Sentence 1
During the run-up, the pilot confirmed the fuel pressure gauge was reading in the green arc before advancing the throttle for takeoff.
Example Sentence 2
A sudden drop on the fuel pressure gauge led the pilot to activate the auxiliary fuel pump before continuing the descent.