How do you remove a petcock from a motorcycle gas tank?
https://www.youtube.com/watch?v=jkvqIp1Bpns
How do you disassemble a petcock?
https://www.youtube.com/watch?v=kVnHDGwIQuQ
How do you test a petcock valve?
https://www.youtube.com/watch?v=TV8GLylj5cM
How do you tell if petcock is on or off?
https://www.youtube.com/watch?v=oXdn8b1U3CM
How do you use a petcock valve?
https://www.youtube.com/watch?v=79XI44gKRG0
How does a vacuum operated fuel valve work?
In a vacuum-operated system, an additional valve is added to what you would find on a gravity-feed system. When there is no vacuum, a spring holds a small o-ring seal in place which stops the flow of fuel. When vacuum is applied, the diaphragm of the valve is pulled in which unstops the flow of fuel.
How does a vacuum fuel pump work on a motorcycle?
So how does a fuel pump work? A fuel pump works by a diaphragm moving and creating alternating vacuum and pressure. This drawing and pushing is regulated by check valves that only allow one-way flow. The geometry of the diaphragm plus the speed of the pulse dictate pressure and volume flow.