Small engine repair

I am having a problem with a priming bulb collapsing while engine is running. It seems to create a vacuum sucking the priming valve closed and then the carb starves and the engine dies. If I let the mower sit it releases the vacuum and the mower runs for a short bit.

Keep off the grass...

If the primer bulb collapses after the engine has been running or stays collapsed while priming this indicates a fuel line restriction upstream from the primer bulb. A defective check valve in the primer bulb could also be the cause. The fuel line filter or the fuel tank pick up could be blocked. A blocked fuel tank vent could also cause this.

Originally posted by epic0002
If the primer bulb collapses after the engine has been running or stays collapsed while priming this indicates a fuel line restriction upstream from the primer bulb. A defective check valve in the primer bulb could also be the cause. The fuel line filter or the fuel tank pick up could be blocked. A blocked fuel tank vent could also cause this.