A cracked primer bulb. You will need to replace it.
No gasoline is reaching the primer bulb.
There does not appear to be a primer bulb on the Stihl BR400 that I can see in the exploded parts.
The carb connection on a primer bulb is typically located on the side of the bulb that connects to the carburetor's fuel intake. When the primer bulb is squeezed, it pushes fuel from the tank into the carburetor, helping to prime the engine for easier starting. The bulb usually has two connections: one for the fuel line from the tank and one that leads to the carburetor. Make sure to refer to your specific engine's manual for precise locations and configurations.
primer bulb replacement on craftsman 32 cc week wacker
To change the primer bulb on a Snapper snowblower, first, ensure the engine is off and cool. Remove the screws or clips that secure the primer bulb assembly to the carburetor and carefully detach the old bulb. Install the new primer bulb by pushing it into the housing, ensuring a snug fit, and then reattach any screws or clips. Finally, test the bulb by pressing it to ensure it primes the carburetor properly.
Don't know that a leaking primer bulb can be repaired. Most likely, you have to replace it. You don't want to forget the routing of the fuel lines!! You might want to make a drawing of the routing before you remove the primer bulb.
There is an orifice in the primer assy. in the carb. that is plugged. You will have to remove and clean the primer assy.
The start primer rubber bulb must be cracked/damaged. Replacement parts are available.
It sucks gas from the gas tank to the carborator using nothing but suction In general the primer bulb draws fuel from the tank through the carb and then returns it to the tank. Look for "carb" and "tank" on the primer bulb and make the respective connection. A line should come from the tank to the carb. Another from the carb to the primer. and another back to the tank.
Most primer equipped carburetors use a diaphragm equipped with flapper valves in between the primer and carb. This allows fuel to be drawn through from the fuel source one way, then pushed through to the throat of the carb the other way. Most primer system failures are due to this diaphragm being torn, pinched shut, inflexible, etc.
cracked gas line, cracked bulb, or weedeater out of gas