I have to shake the discharge pipe to get it to run. Whats wrong?
If you have an automatic unit with an integral float switch, the switch assembly is malfunctioning and the switch, switch arm, and case gasket should be replaced. The average switch life is 4-7 years but may be higher or lower depending on the application. If you have a nonautomatic pump with a variable level float, it may be hung up on something or needs to be replaced.