Methods and systems are provided for reducing an amount of fuel vapors that are routed to a fuel vapor storage canister during a refueling event, in response to an indication that a fuel dispenser that is dispensing fuel to a fuel tank is underperforming. In one example, a method comprises increasing a pressure in the fuel tank responsive to an indication that the fuel dispenser is dispensing fuel at a first rate that is at least a threshold amount below a second rate, without changing the first rate at which the fuel dispenser is dispensing the fuel. In this way, fuel vapor recirculation may be improved and an amount of fuel vapors routed to the canister reduced, which may thus reduce opportunities for release of undesired evaporative emissions to atmosphere.

A plastic filler neck for vehicles includes a fuel injection pipe, a retainer inserted and fastened into an internal space of a tip of the fuel injection pipe to support a refueling gun, a cap holder directly fastened to the tip of the fuel injection pipe by fusion, and an air drain casing mounted, by a mounting bracket, to an outer diameter portion of the cap holder fastened to the fuel injection pipe.

This disclosure is directed to vehicle fuel systems capable of isolating the energy within a fuel tank from the vehicle user. An exemplary fuel system may include a first valve located within a fuel inlet conduit and a second valve located within a vapor recovery recirculation line of the fuel system. The first and second valves may be controlled based on the pressure inside a fuel tank of the fuel system. Fuel may only be transferred into the fuel tank when the fuel tank is within a predefined threshold pressure range. A depressurization sequence of the fuel tank may be automatically initiated when a fuel door of the fuel system is moved to an open position. The positioning of the fuel door may be monitored by a fuel door position monitoring device.

A fuel tank includes a tank main body and a fuel filler neck. A breather hole is provided in an inner surface of the fuel filler neck. A connecting pipe opens to the inside of the fuel filler neck though the breather hole and extends from the fuel filler neck in the radial direction. The inside of the fuel filler neck includes a first vapor-liquid separation chamber therein that is partitioned from the tank main body and connected to the breather hole. Liquid fuel entering the breather channel is reduced.

An exhaust after-treatment system associated with a diesel engine includes a diesel exhaust fluid storage unit. The storage unit includes a diesel exhaust fluid tank and a vent system coupled to the tank and configured to regulate flow of air into the tank and fluid vapor out of the tank.

A fuel filling and vapor recovery system for a vehicle is described. The system includes: a canister that is in communication with a fuel receptacle in the vehicle to collect and filter fuel vapor; a first tube that is connected to the canister; a second tube that is connected to the fuel receptacle; and a canister box that is configured for connection to the first and second tubes. The canister box includes an upper member, and a lower member that is configured for engagement with the upper member such that a watertight seal is formed therebetween to prevent external water intrusion into the canister box. The lower member includes an integral connector that is configured for connection to the first tube to allow the fuel vapor to enter the canister box.

An exhaust after-treatment system associated with a diesel engine includes a diesel exhaust fluid storage unit. The storage unit includes a diesel exhaust fluid tank and a vent system coupled to the tank and configured to regulate flow of air into the tank and fluid vapor out of the tank.

The invention relates to a fuel filler neck for providing fuel to a fuel tank. The fuel filler neck comprises a base tube with an access opening and at least one outlet opening and a flow path from the access opening through an interior of the base tube to the least one outlet opening. Further, the fuel filler neck comprises a transition tube with an access port and an extension tube with at least one outlet port. The transition tube is releasably connected to the extension tube, and a flow passage is provided from the access port through an interior of the transition tube and through an interior of the extension tube to the at least one outlet port. A least a portion of the transition tube is arranged removably and in coverage of the at least one outlet opening within the interior of the base tube.

An object is to enhance the assembly of a breather pipe which is accommodated in a filler pipe.

A nozzle guide (10, 10a, 10b) that is arranged within a filler pipe (110) includes: a main body portion (20, 20b) that guides the insertion and removal of a refueling nozzle (150); and a connection member (50, 50a to 50c) that is provided on an outer circumferential surface (27) of the main body portion (20, 20b) and in which an upper end portion (51) of the connection member is located, in a tank direction (TD) extending from a refueling port (FC) toward a fuel tank (FT), on a downstream side with respect to a tip end portion (152) of the refueling nozzle (150), and the connection member (50, 50a to 50c) includes: a connection portion (52, 52a) connected to a breather pipe (120) that is arranged within the filler pipe (110); and a vapor flow path formation portion (55, 55b, 55c) that forms part of a vapor flow path (220) for the fuel vapor that flows in through the breather pipe (120) and the connection portion (52, 52a).

A fuel supply device includes a valve body and a filter unit accommodating an air filter and a valve cap are attached to a tubular portion provided on a side surface of an inlet pipe. When a fuel tank has a negative pressure, the valve body opens and the negative pressure is eliminated by clean atmospheric air introduction. A projection portion is provided on the filter unit side of the valve body. Accordingly, attachment of the valve body into the tubular portion and attachment of the tubular portion and the filter unit are reliably performed, the reliability of valve body opening and closing is improved, and attachment workability is improved.