Methods and systems are provided for cleaning one or more valve(s) that regulate an amount of fuel vapor routed to an engine of a vehicle in response to an indication that the one or more valve(s) are exhibiting degraded sealing properties. In one example, a method includes timing opening and closing events of the valve to coincide with higher than a threshold pressure differences across the valve as compared to lower than the threshold pressure differences in terms of pressure oscillations across the valve, the pressure oscillations stemming from an intake of the engine. In this way, the one or more valve(s) may be controlled to open under higher loads and stresses on the valve(s), which may dislodge debris, carbon buildup, etc., thus serving to clean the valve.

A housing has an inner passage to communicate with both a fuel passage, which is to conduct fuel from a fuel pump, and a return passage, which is to return fuel a fuel tank. A valve body is movable in the housing to change a minimum flow passage cross-sectional area of the inner passage. A spring is connected to the valve body and changes its biasing load in correspondence with a fuel temperature to move the valve body. The spring moves the valve body such that the minimum flow passage cross-sectional area, when the fuel temperature is equal to or higher than a predetermined vapor generation temperature, is larger than the minimum flow passage cross-sectional area when the fuel temperature is lower than the vapor generation temperature.

A valve device has a valve housing, a valve member, a guide member and a valve control unit. A center axis of a vapor outlet pipe is defined as a passage axis of a vapor outlet passage. A cross section of the vapor outlet pipe on a plane perpendicular to an axial direction of the vapor outlet pipe is defined as an outlet-pipe cross section. An area of the outlet-pipe cross section is defined as an outlet passage area. An overlapping area, in which the outlet-pipe cross section overlaps with an outlet-nearest wall portion, is formed when viewed them in the axial direction of the vapor outlet pipe and when the outlet-pipe cross section is projected on the outlet-nearest wall portion. The valve housing and the guide member are so formed that the overlapping area is smaller than a half of the outlet passage area.

A fluid tank comprising can include an outer housing comprising a housing volume, a first fluid bladder positioned within the housing volume, and a second fluid bladder positioned within the housing volume. The first fluid bladder can comprise a first conduit and the second fluid bladder can comprise a second conduit. The first fluid bladder can be configured to release fluid through the first conduit in response to introduction of fluid into the second fluid bladder via the second conduit. The housing volume can be maintained at a substantially constant pressure when fluid is released from the first fluid bladder through the first conduit and fluid is introduced into the second fluid bladder through the second conduit

Methods and systems are provided for reducing degradation and issues related to noise, vibration and harshness (NVH) for a canister purge valve configured to regulate a flow of fuel vapors from a fuel vapor canister to an engine in response to a request to purge the fuel vapor canister of fuel vapors. In one example, a method may include purging the fuel vapor canister by synchronizing a timing of opening and closing events of the canister purge valve to correspond with instances where a pressure difference across the canister purge valve is lower as compared to higher in terms of pressure oscillations across the canister purge valve during the purging. In this way, higher loads and stress on the canister purge valve may be avoided, thus reducing degradation and NVH issues.

Methods and systems are provided for a zero hysteresis valve. In one example, a valve comprises protrusions shaped to maintain a distance between a moveable portion of the valve and a valve seat.

An in-tank fuel pump assembly and mounting system is disclosed which may be configured for mounting inside a fuel tank. The assembly includes a pump housing, pump mounted to the housing, and pressure relief valve. The housing may comprise upper and lower pump housing units coupled together. The upper housing unit is configured for mounting to a tank opening, which in one implementation may be the fuel fill opening. The lower housing unit extends into the tank to approximately the bottom of the tank. A fuel fill fluid pathway is created through the housing for adding fuel to the tank while the pump assembly remains in situ. The upper housing unit may include a removable fuel cap. The pump housing may include an integral vapor trap.

There is provided a valve device including: a housing; a float valve; and a pressure adjusting valve. A first valve seat is formed from a peripheral edge of a valve hole. An accommodation portion is provided in a protruding manner from a surface of a partition wall. An inner periphery of the accommodation portion is provided with a reduced diameter portion and an increased diameter portion. A height of an upper end of the reduced diameter portion is equal to or greater than a front surface of the pressure adjusting valve in a state where the pressure adjusting valve is in contact with the first valve seat. The pressure adjusting valve is configured to be beyond the upper end of the reduced diameter portion when the pressure adjusting valve is raised to a maximum due to an increase in pressure in a fuel tank.

There is provided a valve device including: a housing in which a valve chamber is provided on a lower side and a ventilation chamber is provided on an upper side via a partition wall, the partition wall being formed with a valve hole; a float valve; and a pressure adjusting valve. An accommodation portion is provided in a protruding manner from a surface of the partition wall. An accommodating space configured to accommodate the pressure adjusting valve is formed on an inner side of the accommodation portion, and an outer space is formed on an outer side of the accommodating space. The accommodation portion is formed with an opening through which the accommodating space and the outer space communicate with each other.

The improved fuel tank isolation valve (100) with separate springs and path of over relief, comprising of fuel tank valve with a canister port (9) and a tank port (8), a seal sub assembly (5), a seal (3) for over pressure relief (OPR), a spring (1) for over vacuum relief (OVR), a spring (4) for over pressure relief (OPR), solenoid (10), moving core (11), wherein the improved fuel tank isolation valve (100) has a separate section or separate chamber (14) for the seal (3) for over pressure relief (OPR), the spring (1) and the spring (4) to meet the technical requirement of spring within less tolerances that also reduce rejection in production line and reduce magnetic force from solenoid (10) to open the path in refuelling condition which results in high accuracy and the seal sub assembly (5) includes a sealing (6) for refuelling function.