Abstract: A “no filter, no run” filtration system that is designed to verify that an appropriate filter cartridge is installed. A flow control sleeve is provided on a standpipe to control the flow of fluid, for example fuel, into the standpipe. The sleeve can be axially moveable between closed and open positions, with one or more members on an installed filter cartridge designed to release the sleeve to permit the movement from the closed position to the open position to allow fluid flow. A spring acts on the sleeve to bias the sleeve back to the closed position upon removal of the filter cartridge. The sleeve can also be designed without axial movement, but nonetheless is configured to be opened and closed to control fluid flow into the standpipe.

Abstract: This invention provides a fluid spring suitable for use with vehicle closures such as liftgates. The fluid spring includes a cylinder having an inner wall. A piston mounted on a rod end portion is disposed within the cylinder defining compression and expansion chambers. The cylinder wall includes at least one groove defining a travel zone along the length of the groove. Another length of the cylinder wall adjoining the groove defines a stop zone. Under a first force, the fluid spring moves rapidly through the travel zone until it reaches the stop zone. A second force greater than the first force is needed to move the gas spring from the stop zone to the next travel zone. The stop zone corresponds to an open position of a closure such as a liftgate.