You need to determine if the delay pump start is from the pressure switch not closing at 40 the way Reach describes or if the pressure switch is sending power to the pump at 40 and the pump/motor is still delayed in starting. If the pressure switch closes and you have voltage to the pump as soon as the pressure drops to 40, you need a clip around amp meter to se if the pump is running or not. If you are getting voltage to the pump and it is not drawing any amperage and starting instantly, the overload in the motor could be tripping. These overloads have an automatic reset after a minute or two, then the pump will draw amperage and start. If the overload is tripping, you probably have a motor problem.