The figure below shows the two main families of acetylcholine receptors: muscarinic and nicotinic. In structural terms, muscarinic receptors are G-coupled protein receptors, while nicotinic receptors are ligand-gated ion channels. They can be found on both sides of the synaptic cleft (presynaptic and postsynaptic).
After the pressure drops below 40 psi, the electrical switch turns on the pump and the pressure in the tank increases. Any failure in any component or loss of electricity can cause a well to suddenly stop producing water when a faucet is turned on.
Well Pump Short Cycling. Short cycling of a well pump is a fairly common problem. One of the most common causes of well pump short cycling is a loss of air charge in your well pressure tank. If the bladder becomes damaged it fails to hold pressure properly and the result is a the pump going on-off, on-off. When your water tank is failing to hold the proper pressure, it usually must be replaced.