If the tank vents block, what happens to fuel pressure?

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Multiple Choice

If the tank vents block, what happens to fuel pressure?

Explanation:
Venting lets air enter the tank as fuel is drawn off, keeping the tank pressure near ambient. If the vents are blocked, air cannot replace the volume of fuel leaving, so a vacuum forms in the tank and in the fuel lines. The pump must pull fuel against this vacuum, causing the pressure in the system to fall as more fuel is pumped out. Therefore, fuel pressure decreases steadily.

Venting lets air enter the tank as fuel is drawn off, keeping the tank pressure near ambient. If the vents are blocked, air cannot replace the volume of fuel leaving, so a vacuum forms in the tank and in the fuel lines. The pump must pull fuel against this vacuum, causing the pressure in the system to fall as more fuel is pumped out. Therefore, fuel pressure decreases steadily.

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