Should the motorcycle fuel switch be up or down?
2 Answers
Different brands and models of motorcycles have different fuel tank switches, and you need to check the markings on the fuel tank switch to determine. Below are specific details about motorcycle fuel: 1. Markings: Generally, "ON" or a full cup of water symbol represents the main fuel tank, while "RES" or a half cup of water symbol represents the reserve tank. Typically, the main tank is used when the switch is down, the reserve tank is used when the switch is up, and the fuel supply is off when the switch is parallel. 2. Switch: Move the fuel tank switch lever and observe which marking the arrow on the lever points to, indicating which fuel tank function is being used. In reality, there is only one fuel tank; the so-called main and reserve tanks are simply two different fuel outlets at varying heights on the fuel tank switch. Moving the lever up engages the reserve tank. After refueling, the lever should be moved down; otherwise, using the reserve tank continuously will deplete the fuel without notice.
I've been riding motorcycles for decades and know all about the fuel valve. That thing is usually called a petcock, located at the bottom of the tank with three position markings: ON, OFF, and RESERVE. When you turn it to the ON position, fuel flows downward, meaning it goes from the tank to the carburetor to power the engine. This design relies on gravity to help deliver the fuel. If it's pointing upward, it might be in the OFF or RESERVE position, cutting off the fuel supply. Once, I forgot to check and left the valve pointing up, only to run out of fuel and stall midway—pretty dangerous. Since then, I've made it a habit: before every ride, I toggle the valve to confirm it's in the downward position to start the engine; before long trips, I fill up the tank and check the fuel lines for aging or cracks; and I regularly clean out debris inside the petcock to prevent clogs. These small details matter for safety—don't overlook them, especially when riding rural night roads with no help around. Proper maintenance can extend your motorcycle's lifespan.
