rahulyadav | Explaining Everythinng on Instagram: "Transferring fuel manually often results in dangerous spills and messy backwash. This is the Pressure-Differential Fuel Pump, an ingenious DIY engineering hack that uses a plastic bottle and a straw to create a high-efficiency fluid vacuum. The critical step is the atmospheric seal. By inserting a straw through the bottle cap and a second venting tube into the side of the bottle, you create a dual-port system. When you compress the bottle, it fo