Where is the in and out a primer bulb?

The "in" and "out" markings on a primer bulb indicate the direction of fuel flow. The "in" side typically connects to the fuel tank or line bringing fuel to the bulb, while the "out" side directs the fuel towards the engine or carburetor. Properly connecting these lines ensures the primer bulb effectively primes the fuel system for starting. Always refer to the specific equipment's manual for accurate installation guidance.