What do fuel booster and auxiliary pumps ensure when changing tanks?

• A. Ensure continuous fuel supply and steady pressure when changing tanks
• B. They heat the fuel
• C. They signal low fuel
• D. They reduce fuel viscosity

Answer: (A)

Maintaining a continuous, stable fuel flow and pressure as you switch tanks. The booster and auxiliary pumps provide extra fuel pressure and flow to the engine’s fuel system during tank changes, so the engine never experiences a drop in supply or a dip in pressure while the source tank is being changed or when crossfeeding between tanks occurs. This helps overcome head losses and keeps the feed line primed, ensuring smooth fuel delivery even as the source switches from one tank to another or as demand changes during takeoff, climb, or other maneuvers. They’re there to guarantee uninterrupted fuel supply, not to heat fuel, signal low fuel, or alter fuel viscosity.