Patent ID: 9731595
Date: 2017-08-15
CPC Classifications: B60K

Claim:
1. A fuel tank closure system, comprising: a fuel tank to hold hydrocarbon fuel, the fuel tank having a tank wall of thermoplastics with a barrier layer for hydrocarbons, with at least one orifice having a circumference; a closure cap which cooperates with a closure means of the fuel tank to cover the orifice, wherein the closure means is provided at the circumference of the orifice and configured such the closure cap is fastenable to the fuel tank; at least one first seal enclosed between the closure cap and an outer surface of the tank wall; and at least one second seal in a region of the orifice which covers or shields a part of the tank wall exposed to hydrocarbon fuel when placed in the fuel tank; wherein the orifice has an edge with a circumferential face defined by a cross-sectional thickness of the tank wall, and the second seal covers or shields the cross-sectional thickness of the tank wall defining the circumferential face of the edge of the orifice from exposure to the hydrocarbon fuel; and wherein the second seal comprises a surface treatment of the tank wall, which is restricted to treating the tank wall in the region of the orifice.