Overfill Prevention System

Abstract

This invention relates to an overfill prevention system for preventing the overfilling of tanks when filling up large tanks from a fuel distribution truck. The system operates by monitoring and automatically controlling the filling process by use of a power take off switch assembly that is connected electronically to a secondary overfill prevention system that is also connected to a signal probe located in the tank that is being filled. In operation, once fuel contacts the signal probe, a communicator signal is sent from the signal probe to a secondary overfill prevention system, which interrupts a looping electrical current through a fuel shut off sensor assembly to a power take off switch assembly along a connecting cable. Once the looping electrical current no longer returns to the power take off switch assembly, an indicator light turns off and a pneumatic switch is flipped, which automatically stops the flow of air from the distribution truck's air tank to the power take off that drives a pump that is controlling the flow of fuel. This stops the flow of fuel to the tank and prevents costly, damaging and dangerous overfills.

Dependencies are inferred from the claim text.