Replace a cranky old switch in about an hour. Switches come in three pressure ranges: 20 to 40, 30 to 50 and 40 to 60 pounds per square inch (psi).

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Temporary Quick Fix. If banging on the tube under the pressure switch kicks on the well pump, it means the contact surfaces of the electrical contacts are pitted or burned, causing a poor connection.

For the electric fuel pump application, the relay-actuating switch will be a common three-prong oil-pressure switch that screws into a 1/8-27 NPT oil pressure port on the engine.

Several years ago, Grundfoss came out with a SS pump, pressure switch and diaphragm tank in one small, easy-to-install package. The model is MQ3-45. It sits on its own base, ...