You don't. They are not difficult to replace.
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.
To fix a leaking PVC joint on a seal, you can try tightening the joint, applying PVC primer and cement, or using a repair coupling.
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To fix a leaking PVC pipe joint, you can try tightening the joint with a wrench, applying PVC primer and cement to reseal the joint, or replacing the joint if it is damaged beyond repair.
To fix a leaking PVC joint, you can try tightening the joint, applying PVC primer and cement, or using a repair coupling. If these methods don't work, you may need to replace the joint altogether.
Primers are not waterproof. If you have a windowsill area that is leaking, you'll have to determine the path the water is coming from, repair the damage that is causing the leak then prime and paint.
If your bathtub pipe is leaking, it requires immediate repair.
If your home radiator is leaking, it needs immediate repair.
If your toilet bowl is leaking, it requires immediate repair.
Is your garbage disposal leaking and in need of urgent repair?
If your shower pipe is leaking, it may need immediate repair.
get a coupling and the fitting that needs replaced. cut out the pipe that is leaking and reeplace it. use plenty of glue and primer. hold the fittings together for at least 1 minute after gluing.