Abstract: A universal filler cap assembly having a base member receiving an elastic bushing, a collar, and a cap. The base member has an annular abutting surface and a threaded stem, and the cap has a stem with mating threads. As the cap is threaded onto the base member, the bushing is compressed between the abutting surface and the collar, causing the elastic bushing to bulge in a lateral direction. This bulge presses against the internal surface of the neck of a tank, forming a fluid-tight seal. When the cap is unthreaded from the base member, the compressive force on the bushing is released and it returns to its original shape, snugly fitting around the stem of the base member.

Abstract: A portable fuel dispensing system comprises a fuel pump assembly, a conduit, and a fuel tank cap assembly. The dual line conduit permits vapor in an external fuel tank to be evacuated via a vapor line in the conduit and collected in the reservoir of the portable fuel container. The conduit and the fuel tank cap assembly comprise mating couplers having valves biased closed when disconnected from the mating coupler. In use, the fuel tank cap assembly is threaded to the external fuel tank, and the conduit coupler is connected to the cap coupler, forming a fluid-tight connection between the conduit and the fuel tank cap assembly. Thereafter, the external fuel tank is replenished by manipulating the pump assembly. The pump assembly further comprises release valves disposed in the pump body assembly to alleviate pressure differences between the reservoir of the portable fuel container and the external ambient pressure.