To help prevent siphon action, which configuration is recommended?

To help prevent siphon action, which configuration is recommended?

• A. Keep connections above level of the top of the fuel tank
• B. Install device at the fuel vent
• C. Place connection below tank bottom
• D. Use a taller hose

Answer: (A)

Preventing siphon action comes down to avoiding a continuous downward path for fuel from the tank to an outlet. If all fuel-line connections stay above the top of the tank, air can enter the line and break any suction before fuel keeps flowing, so a siphon cannot be sustained. Keeping the connections high effectively stops gravity-driven flow from starting. The other options either introduce or fail to break a downward path that could allow siphoning or rely on a taller hose without guaranteeing an air break.

Preventing siphon action comes down to avoiding a continuous downward path for fuel from the tank to an outlet. If all fuel-line connections stay above the top of the tank, air can enter the line and break any suction before fuel keeps flowing, so a siphon cannot be sustained. Keeping the connections high effectively stops gravity-driven flow from starting. The other options either introduce or fail to break a downward path that could allow siphoning or rely on a taller hose without guaranteeing an air break.