A backpressure test is a procedure for installation and testing of a Vapor Recovery Systems at Vehicle fueling depots.
A Backpressure test is conducted to prove that displaced vapors are moving from the vehicle’s fuel tank to the station’s storage tank.
The test simulates the pressure required to move the vapors during a fueling operation. The pressure-inducing gas used in the test is nitrogen.
The Environmental Protection Agency is concerned with vapor recovery. The number of gallons of gasoline lost to vaporization in the United States is over 140 Million gallons a year.