A filter element for a fuel filter has first and second end plates and a particle filter medium arranged between the first and second end plates. A bayonet protrusion on the first end plate is designed to engage a bayonet receptacle of the filter housing by rotation of the filter element about a filter element longitudinal axis. An internal sealing element on the second end plate is designed to separate a raw side from a water collecting chamber of the fuel filter. The filter housing has a filter housing body and a cover screwed onto the filter housing body. The filter housing has a bayonet receptacle arranged on its inner side. By rotating the filter element about a filter element longitudinal axis of the filter element, the bayonet protrusion engages the bayonet receptacle of the filter housing when the cover is unscrewed from the filter housing body.

A filter element is provided with a filter medium and a first end disk connected to the filter medium. A first bayonet protrusion is disposed on the first end disk and designed to engage behind a first bayonet receptacle of a filter housing of a filter. The first bayonet protrusion has a free end. The first bayonet protrusion projects at least over sections thereof in a radial direction relative to a filter element longitudinal axis of the filter element past the filter medium. The free end projects in the radial direction toward the filter element longitudinal axis. A filter with a filter housing provided with a first bayonet receptacle is provided and the filter element is arranged in the filter housing such that the first bayonet protrusion on the first end disk engages behind the first bayonet receptacle of the filter housing.

Systems, devices, and methods of using fuel quality indicators for indicating presence of water within a fuel source such as gasoline. The fuel quality indicator comprises a first indicating member and a second indicating member. The second indicating member is traversable to multiple positions relative to the first indicating member. The second indicating member is designed to float in the presence of water, sink in fuel such as gasoline, and be made of a material which maintains structural integrity when in the presence of fuels. In a preferred embodiment, the first indicating member and the second indicating member are co-axially aligned, with the second indicating member positioned over and oriented around the first indicating member.

A fuel tank disinfection system, including one or more ultraviolet (UV) light emitters disposed within a fuel tank and configured to irradiate one or more water collecting areas within the fuel tank with UV light; and one or more UV light sensors disposed within the fuel tank and in proximity to the one or more water collecting areas and configured to measure the UV light irradiated on the one or more water collecting areas.

A fuel filter includes: a casing having a chamber for collecting water separated from fuel; a water level sensor that extends into the casing and is provided with an electrical water level contact extending into the collection chamber and an intermediate electrical contact arranged inside the casing and outside the collection chamber; and a water separator element having: a filtering element; a filtering element support provided with a through opening crossed by the water level sensor so that the electrical water level contact extends into the collection chamber; and a conductive element provided on the filtering element support and provided with: a water level electrode extending into the collection chamber; and a contact electrode electrically connected with the water level electrode, spaced apart from it and in contact with the intermediate electrical contact of the water level sensor.

The invention relates to a separating device (1) for fluid-collecting sumps, in particular of filter or water separators, comprising a line pipe (10) which has a connection opening (11) and an outlet opening (12), wherein the line pipe (10) is equipped with a flow restrictor (20), a phase detection sensor (30) for detecting a phase boundary (G) between a light fluid (F1) and a heavy fluid (F2), and an electronically actuatable outlet valve (40) between the phase detection sensor (30) and the outlet opening (12). The outlet valve (40) is actuated by a regulating device (45) such that the outlet valve (40) is brought from an open position into a closed position when a phase boundary (G) is detected by the phase detection sensor (30). The invention additionally relates to fluid container devices (100) comprising a fluid-collecting sump (101) and such a separating device (1).

The invention relates to a separating device (1) for fluid-collecting sumps, in particular of filter or water separators, comprising a line pipe (10) which has a connection opening (11) and an outlet opening (12), wherein the line pipe (10) is equipped with a flow restrictor (20), a phase detection sensor (30) for detecting a phase boundary (G) between a light fluid (F1) and a heavy fluid (F2), and an electronically actuatable outlet valve (40) between the phase detection sensor (30) and the outlet opening (12). The outlet valve (40) is actuated by a regulating device (45) such that the outlet valve (40) is brought from an open position into a closed position when a phase boundary (G) is detected by the phase detection sensor (30). The invention additionally relates to fluid container devices (100) comprising a fluid-collecting sump (101) and such a separating device (1).

Embodiments herein relate to water in fuel sensing systems that can be mounted on-vehicle. In an embodiment, a water in fuel sensing system is included having a light source, a light detector, and a sensor controller, wherein the sensor controller is in signal communication with the light detector and the sensor controller is configured to evaluate signals received from the light detector, identify water droplets based on the signals received from the light detector, record information regarding the classified water droplets, and generate an estimate of an amount of water in a fuel. Other embodiments are also included herein.

A fuel-water separator includes a cartridge assembly and a bowl. The cartridge assembly receives a fuel-water mixture and provides a fuel. The cartridge assembly includes an endplate. The bowl is configured to store water separated from the fuel-water mixture. The bowl is coupled to the endplate. The endplate includes an air vent that receives air from the bowl. The air vent establishes a pressure equilibrium within the bowl and the cartridge assembly.

A droplet detection system includes a sensing channel, such as a microfluidic channel, configured to receive a flow of fluid that may contain one or more liquid droplets dispersed in the fluid. The cross-sectional area of the sensing channel maybe configured to allow droplets of a predetermined size to flow through the channel one at a time. A light source, a light aperture, and a light detector are positioned outside the sensing channel, which use light in a selected frequency band that has a substantially different absorbance for the liquid compared to the fluid. Liquid droplets may be detected and characterized using a signal from the light detector.