Which components help maintain continuous fuel pressure during tank changes?

• A. Booster and auxiliary pumps
• B. Vent lines
• C. Fuel strainers
• D. Expansion space

Answer: (A)

The idea being tested is how a fuel system keeps delivering fuel without interruption when you switch from one tank to another. Electric booster pumps and auxiliary pumps provide a positive, steady pressure in the fuel feed line. When tanks are being changed or the engine-driven pump isn’t yet delivering optimal flow, these pumps ensure fuel continues to flow to the engine, preventing pressure loss that could cause fuel starvation or air in the line. They act as a backup and prime the system so switching tanks doesn’t interrupt supply.

Vent lines, fuel strainers, and expansion space have other roles. Vent lines manage vapor and pressure relief, strainers remove contaminants, and expansion space accommodates volume changes; none of these actively maintain continuous pressurized fuel during tank changes the way booster and auxiliary pumps do.