Fuel system leak detection involves monitoring pressure rise in tank with both valves closed and recording pressure rise over defined time after increasing pressure to defined level

摘要

The method involves forming a vacuum in the tank (13) with the cleaning valve open and the venting valve (18) closed, monitoring the pressure rise in the tank with both valves closed and recording the pressure rise over a defined time after increasing the pressure to a defined level. The tank is vented to atmosphere via the venting valve, then sealed by closing the venting valve, then the amounts by which the pressure in the tank rises is measured over time. An Independent claim is also included for a method of conducting a two-part leak test.