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switch on push primer bulb or choke the engine set throttle pull rope or turn key
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.
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.
Primer bulbs on small engines take the place of a choke on the carb . If your carb has a choke on it then you could probably bypass it . The object of the primer and the choke is to give the engine a extra charge of gas to help it start when the engine is cold . If you take this away then the engine will be hard starting if it starts at all .
Go to your local Small Engine Repair shop and ask for a gas cap with the primer pump on cap. They work great!
not getting gas.... needs carb cleaned
primer bulb replacement on craftsman 32 cc week wacker
depends on the engine Briggs or tech, does it have a primer bulb. but safe bet right next to the carb.
Most common cause of surging is a dirty/clogged air filter.
I'm fairly sure you cannot put a light bulb in a lawnmower. You could lay it on the deck somewhere but it would never light up but your question was in a lawnmower not on a lawnmower,... on so the answer would be that this is not a valid question.