Patent ID: 7527065

Claim:
A fuel supply system comprising: a dispenser pump having a shear valve at the bottom thereof for directing fuel into the dispenser pump; a dispenser sump located directly below the dispenser pump; a fuel tank; a piping system for conveying fuel from the fuel tank into the dispenser sump; the piping system comprising an inner pipe for conveying fuel and an outer pipe surrounding the inner pipe for containment of leaks therefrom; an inner flexible connector extending through the dispenser sump and coupled between the end of the inner pipe and the shear valve for completing the conveyance of fuel into the dispenser pump; an outer flexible connector coupled to the end of the outer pipe and the shear valve, wherein the flexible connector is coupled between the end of the outer pipe and the shear valve; and means for continuously maintaining a predetermined pressure selected from the group consisting of a predetermined positive pressure and a vacuum seal within the interstitial space between the inner flexible connector and the outer flexible connector.