Pump Vacuum
how do i fill up a motorbike with gas with the fuel pump vacuum?
Sorry, no can do. A motorcycle’s fuel pump doesn’t create a vacuum in the fuel tank. It’s an electric pump that “pushes” fuel out of the tank. Any negative pressure created in the tank is relieved by fuel returning through the return line. Therefore, no vacuum.
Car’s built before the 70′s used a mechanical fuel pump, that actually “sucked” fuel out of the tank creating a vacuum. That’s the type of fuel pump that you would need to perform that.

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