Gm Global Technolgoy Operations, Inc.

Raffi Der Manuelian

Timothy E McCarthy

Kenneth J Kalvelage

A vehicle fuel emissions system includes a fuel tank, a tank pressure sensor indicating a pressure differential between the tank and a port communicating with the atmosphere, a pump for selectively producing vacuum in the tank, and a passage connecting the pump and a pressure sensor air reference port external to the system.

Checking functionality of fuel tank vapor pressure sensor

A fuel filler neck assembly is provided for use in a vehicle including a gas cap and housing assembly and a fuel tank. The vehicle has a plurality of predetermined final vehicle dimensions dictating a predetermined variety of final filler neck dimensions. The fuel filler neck assembly extends between the gas cap and housing assembly and the fuel tank for transferring fuel into the fuel tank. The filler neck assembly includes at least one axially elongated fill pipe having an axial length and including a plurality of raised, annular beads thereon. The beads are axially spaced along the fill pipe at predetermined distances each corresponding to respective predetermined final filler neck dimensions. The fill pipe is severable adjacent to each of the beads for permitting adjustment of the length of the fill pipe to each of the corresponding predetermined final filler neck dimensions such that upon severance of the fill pipe, the fuel filler neck assembly is adjustable to accommodate the various predetermined final vehicle dimensions. Preferably, the annular beads are irregularly spaced along the axial length of the fill pipe. Also, preferably the fill pipe is made of a metallic material for reduction of hydrocarbon permeation through the filler neck assembly.

Fuel filler neck assembly

A dual fuel tank system for a vehicle including a fill limiter tee disposed in the fill limiter line of the main fuel tank through which fuel is transferred from the auxiliary tank to the main tank and fluid can flow between the two tanks.

Growing community of inventors

Grand Blanc, MI, United States of America

Raffi Der Manuelian